JP2002218431A - Broadcast receiving apparatus, module used for the apparatus, and broadcast receiving method - Google Patents

Abstract

(57) [Summary] [PROBLEMS] In spite of a program that a broadcast station finitely permits viewing, a viewer can view this program indefinitely / use a service. A time memory 154 in a module 151 forms an apparently irreversible clock, and controls viewing by referring to the clock. Thus, even if the viewer intentionally semi-permanently views a program that can be viewed with a time limit stored in the storage device 104 and intentionally resets or stops the clock 116 in the receiving device main body 100,
This fraud can be detected and the viewer cannot watch this program.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a broadcast receiving apparatus used in a pay station broadcasting system comprising a broadcasting station center system and a plurality of subscriber receiving apparatuses. Also, the present invention relates to a broadcast receiving device to be used, a module used in the device, and a broadcast receiving method.

[0002]

2. Description of the Related Art In recent years, television broadcasting services using artificial satellites have become widespread. In particular, digital broadcasting services using broadcasting satellites and communication satellites have recently been operated. Generally, in a satellite broadcasting system, a pay broadcasting service is operated by various methods such as channel units, program units, and time units.

A conventional pay broadcasting system using satellites will be described with reference to FIG.

In FIG. 15, a center 1501 is generally a broadcasting station, and a broadcast signal transmitted from the center 1501 is transmitted to each home via a broadcasting satellite 1502. The transmitted signal is received by satellite dish 1503 installed in each home. The signal received by the satellite dish 1503 is received by the receiver 1
After the signal is demodulated and the data is decoded at 504, it is output to the television receiver 1505. Thereby, the user can receive the broadcasting service. Although the receiving device 1504 is provided separately from the television receiver 1505 in FIG.
May be built in the television receiver 1505.

[0005] The receiving apparatus 1504 may have a module for managing and controlling contract information of pay broadcasting. Generally, an IC card is used as a module.

[0006] Individual information is transmitted from the center 1501 to the receiving device 1504 according to the contents of the contract with the user. The transmitted individual information is generally EMM (Enti
This is called “tlement management message” data, and an ID number unique to the receiving device 1504 is added.

[0007] EMM data is multiplexed from a center 1501 to a broadcast signal and transmitted to each receiving device 1504.

[0008] Receiving apparatus 1504 compares the ID number unique to receiving apparatus 1504 included in the EMM data with the ID number of the receiving apparatus 1504 itself, and outputs individual information corresponding to the EMM data of receiving apparatus 1504 itself. And stored in the IC card. Then, the user can receive a pay broadcast service based on the contract information included in the individual information.

An ECM (Entitlement) composed of program information and billing information for each program, a descrambling key for descrambling a scrambled program, and the like.
Control Message) data is multiplexed with the program and transmitted to each receiving device in common. When viewing paid broadcast programs, EC
Viewing control is performed by comparing and referring to the M data and the contract information.

[0010] There are various charging methods for pay broadcasting services. In general, (1) a viewing contract form in which a contract is made for each channel at a monthly month of broadcasting, (2) a contract form in which a contract is made for each genre of a program, and (3) a fee is paid in advance and charged for each program or viewing time. (4) Call the center at the time of viewing to purchase and view programs,
(5) The viewed program or time is stored in the receiving device 1504, and after viewing, the viewing history data is stored in the center 1501.
There is a viewing contract form in which the user collects and charges for the service.

The above three viewing contract forms (1) to (3) are viewing contract forms that can be realized by the unidirectional system from the broadcasting station to the receiving device 1504, and the two viewing contract forms (4) and (5) described above. The viewing mode is the receiving device 1504 and the center 1
It is necessary to perform bidirectional information transmission with the communication device 501. In the three viewing contract forms (3) to (5) described above, billing is performed based on the viewed program or time.
This is called PV (pay-per-view) viewing.

In general, for PPV viewing in a pay-broadcasting system using satellite broadcasting, a telephone modem is built in a receiving device 1504 and connected to a public line network 1506 so that the center 150
1 and the receiving device 1504 communicate with each other, and the viewing history data is transmitted from the receiving device 1504 to the center 1501.

There is a storage broadcasting service as a new service in the future. The stored broadcast service is to provide a large-capacity storage device such as a hard disk in a receiving device, temporarily store a broadcast program in the large-capacity storage device, and shift the time to service the viewer.

The viewer can view the stored broadcast program a plurality of times indefinitely or finitely in terms of time or the number of times of viewing.

In the case where the stored program is serviced in a limited time, the broadcasting station provides the receiving device with information on the program expiration date and time and the period of the stored program when the program is stored. Also transmit.

The transmitted viewing expiration date and time and the information of the expiration date are managed by the receiving device 1504, and by comparing with the clock in the receiving device 1504, the program reproduced from the large-capacity storage device is compared with the viewing expiration date or the viewing period. At times, control is performed so that the viewer can view the program, and control is performed so that the viewer cannot view the program when the viewing expiration date or the viewing period has passed.

The problem here is that the viewer or a third party can illegally change the clock in the receiving device 1504, stop the clock, or easily change the clock data.

If the time of the clock in the receiving device 1504 is illegally changed, the viewer can view / listen to this program indefinitely, despite the program being finitely permitted by the broadcasting station.
There is a problem that services can be used.

As described in Japanese Patent Application Laid-Open No. H11-205707, there is a method of transmitting secure time information from a broadcasting station to control a viewing expiration date. Is recorded, and the past time information is replaced with the secure time information sent from the broadcasting station.

[0020]

As described above, in the conventional broadcast receiving apparatus, the viewer can view the program indefinitely even though the program is finitely permitted by the broadcast station.
There was a problem that services could be used.

[0021] The present invention relates to a storage broadcast service,
A broadcast receiving device that cannot view / use the reproduced program when the clock or time data is changed for a program that can be viewed / used in a limited time, and a module used in the device. And a broadcast receiving method.

[0022]

In order to achieve the above object, according to the present invention, (1) a module which stores an encrypted pay broadcast program in a receiving apparatus main body and is separable from the receiving apparatus main body. In the receiving apparatus for controlling whether the pay-broadcast program can be reproduced and viewed by the receiving apparatus, the receiving apparatus body is provided in the receiving apparatus body, and the encrypted pay-broadcast program is stored in the receiving apparatus body. Clock means for outputting the generated current time to the module; a non-volatile memory provided in the module for a power supply for storing the current time; and the current time provided in the module and input from the clock means. Only when the time is ahead of the current time stored in the memory, the current time input from the clock means is set as a new current time. Current time updating means to be stored in the memory; and, from the receiving device main body to the module, viewing time limit information indicating a viewing time limit or a viewing time period of the encrypted pay broadcast program stored in the storage means; Information output means for outputting an encrypted decryption key in which a decryption key for decrypting the encrypted pay broadcast program signal is provided, and the encrypted decryption key provided from the information output means is provided in the module. Key means for decrypting the decryption key and generating a decryption key for decrypting the encrypted pay broadcast program, and the current time provided in the module and input from the clock means is input from the memory. And the current time input from the clock means is in accordance with the viewing expiration information input from the information output means. Broadcast receiving means for outputting the decryption key generated by the key means from the module to the main body of the receiving apparatus only when the listening time or the viewing period is within the range. Provide equipment.

Further, in the present invention, (2) the current time updating means has a counting means for counting the number of times the current time is input from the clock means,
The broadcast receiving device according to (1), wherein the current time input from the clock means is stored in the memory when the count value of the counting means reaches a predetermined value.

Also, in the present invention, (3) the current time update means calculates a time difference between the current time input from the clock means provided in the module and the current time input from the memory. (1) when the time difference becomes larger than a predetermined value, the current time inputted from the clock means is stored in the memory as a new current time. And a broadcast receiving apparatus according to (1).

Further, according to the present invention, there is provided (4) a volatile memory which is volatile with respect to a power supply, and a temporary current time storage means which stores the current time inputted from the clock means in the volatile memory. The time updating means, when the current time input from the clock means is ahead of the current time stored in the temporary current time storage means, updates the current time stored in the temporary memory to the clock means. The temporary current time storage unit updates the current time input from the clock unit when the number of times the current time input from the clock unit has reached a predetermined number, or the clock provided in the module. Input from the clock means when the difference between the current time input from the means and the current time input from the memory becomes larger than a predetermined value. Serial stores the current time, the decryption key means, said current time input from the clock means,
Means for outputting the decryption key generated by the key means from the module to the receiving apparatus main body only when the time is within the range of the viewing expiration date and is earlier than the time stored in the volatile expiration memory and the volatile memory. The broadcast receiving device according to (1), comprising:

Also, in the present invention, (5) the memory is a plurality of nonvolatile memories for storing the current time, and pointer means for outputting a pointer indicating which one of the plurality of memories is used. Wherein the current time input from the clock means is sequentially written to the plurality of memories in accordance with the pointer input from the pointer means. Is provided.

According to the present invention, (6) the encrypted pay broadcast program is stored in the receiving apparatus main body together with absolute or relative program time information indicating the program broadcast elapsed time, and separated from the receiving apparatus main body. In a receiving apparatus for controlling whether or not the pay-broadcast program can be reproduced / viewed by a possible module, a storage unit provided in the main body of the receiving apparatus for storing the encrypted pay-broadcast program; A clock means provided to output the generated current time to the module; a non-volatile memory provided to the module to store the current time;
The current time input from the clock means is provided to the memory only when the current time input from the clock means is provided in the module and is ahead of the current time stored in the memory. Storing the current time updating means, the receiving apparatus main body, the module, and the viewing time limit information indicating the viewing time limit or viewing time period of the encrypted pay broadcast program stored in the storage means; Information output means for outputting an encrypted decryption key in which a decryption key for decrypting a signal of a pay broadcast program is encrypted, and the encrypted decryption key provided in the module and input from the information output means And key means for generating a decryption key for decrypting the encrypted pay broadcast program, provided in the module, The difference between the degree of advance of the time of the program time information input to the timer and the degree of advance of the time of the current time input from the clock is within a predetermined range, and the difference between the degree of advance and the time Only when the current time is within the range of the viewing period or the viewing period according to the viewing period information input from the information output unit, the module is generated from the module to the receiving device body by the key unit. And a decryption key means for outputting the decryption key.

Further, in the present invention, (7) the encrypted pay broadcast program is stored in the main body of the receiving apparatus, and whether or not the pay broadcast program can be reproduced / viewed by a module separable from the receiving apparatus main body. In the receiving device to be controlled,
A storage unit provided in the reception device main body, for storing the encrypted pay broadcast program; a clock unit provided in the reception device main body, for outputting the generated current time to the module; and a clock unit provided in the module. A nonvolatile memory for a power supply that stores the current time; and a memory provided in the module, wherein the current time input from the clock means is ahead of the current time stored in the memory. Only, a current time update unit that stores the current time input from the clock unit as a new current time in the memory, and the encrypted data stored in the storage unit from the receiving device main body to the module. The expiration date information indicating the expiration date or the viewing period of the pay broadcast program and a decryption key for decrypting the encrypted pay broadcast program signal are encrypted. A decryption key that is, an information output means for outputting the program start time information indicating the absolute of the program start time of the pay broadcast program is provided in the module,
Key means for decrypting the encrypted decryption key input from the information output means and generating a decryption key for decrypting the encrypted pay-broadcast program; provided in the module; input from the clock means Only when the current time input is ahead of the current time input from the memory and the current time input from the clock means is within the range of the program start time information, The present invention provides a broadcast receiving apparatus, comprising: a decryption key means for outputting the decryption key generated by the key means to the receiving apparatus body.

Further, the present invention provides (8) the broadcast receiving device according to (1) or (6), wherein the decryption key and the viewing expiration information are stored in the storage device.

According to the present invention, (9) the broadcast receiving device according to (7), wherein the decryption key, the viewing expiration information, and the program start time information are stored in the storage device. I do.

Further, the present invention provides (10) the broadcast receiving device according to (1) or (6), wherein the decryption key and the viewing expiration information are stored in the module.

Also, the present invention provides (11) the broadcast receiving apparatus according to (7), wherein the decryption key, the viewing expiration information, and the program start time information are stored in the module. .

Further, in the present invention, (12) at least one of the viewing time limit information and the current time information output from the receiving device body to the module is encrypted (1). Or (6)
And a broadcast receiving apparatus according to (1).

According to the present invention, (13) at least one of the viewing time limit information, the current time information, and the program start time information output from the receiving device main body to the module is encrypted. The broadcast receiving device according to (7) is provided.

Further, in the present invention, (14) the encrypted pay broadcast program is stored in the main body of the receiving apparatus, and whether or not the reproduction / viewing of the pay broadcast program can be performed or not is determined by a module separable from the main body of the receiving apparatus. In the receiving method for controlling, a step of storing the encrypted pay broadcast program by a storage unit provided in the main body of the receiving apparatus, and a step of storing the current time generated by the clock means provided in the main body of the receiving apparatus. Outputting to the module, the current time input from the clock means by the current time updating means provided in the module, wherein the non-volatile memory is stored in a power supply for storing the current time. Storing the current time input from the clock means as a new current time in the memory only when the current time is ahead of the current time; The broadcast output means outputs, from the receiving device body to the module, viewing expiration date information indicating a viewing expiration date or a viewing period of the encrypted pay broadcast program stored in the storage means, and the encrypted pay broadcast program. Outputting an encrypted decryption key in which a decryption key for decrypting the signal has been encrypted; and by means of a key provided in the module, the encrypted decryption key input from the information output means is output. Decrypting and generating a decryption key for decrypting the encrypted pay broadcast program; and decrypting the current time input from the clock means by the decryption key means provided in the module. And the current time input from the clock means is in accordance with the viewing expiration information input from the information output means. Outputting the decryption key generated by the key unit from the module to the receiving device main body only when the viewing time is within the viewing period or the range of the viewing period. provide.

According to the present invention, (15) the encrypted pay broadcast program is stored in the receiving apparatus main body together with absolute or relative program time information indicating the program broadcast elapsed time, and separated from the receiving apparatus main body. In a receiving method for controlling permission / inhibition of reproduction / viewing of a pay broadcast program by a possible module, a step of storing the encrypted pay broadcast program by a storage means provided in the receiving device body; Outputting the generated current time to the module by clock means provided in the apparatus main body; and updating the current time input from the clock means by the current time update means provided in the module to the current time. Only when the current time is ahead of the current time stored in the non-volatile memory with respect to the power supply that stores Storing the current time in the memory, and, by the information output means, from the main body of the receiving apparatus to the module, and viewing the expiration date or the viewing expiration date of the encrypted pay broadcast program stored in the storage means. Information, and a step of outputting an encrypted decryption key in which a decryption key for decrypting the encrypted pay-broadcast program signal is output; anda key means provided in the module, from the information output means. Decrypting the input encrypted decryption key and generating a decryption key for decrypting the encrypted pay-broadcast program; and a decryption key means provided in the module, the receiving apparatus main body. The difference between the degree of advance of the time of the program time information input to the module and the degree of advance of the time of the current time input from the clock means is within a predetermined range. The reception from the module only when the current time input from the clock means is within the range of the viewing time limit or the viewing time period according to the viewing time limit information input from the information output means. Outputting the decryption key generated by the key means to an apparatus main body.

Also, in the present invention, (16) the encrypted pay broadcast program is stored in the main body of the receiving apparatus, and the module capable of being separated from the main body of the receiving apparatus determines whether the pay broadcast program can be reproduced / viewed. In the receiving method for controlling, a step of storing the encrypted pay broadcast program by a storage unit provided in the main body of the receiving apparatus, and a step of storing the current time generated by the clock means provided in the main body of the receiving apparatus. Outputting to the module, the current time input from the clock means by the current time updating means provided in the module, wherein the non-volatile memory is stored in a power supply for storing the current time. Storing the current time input from the clock means as a new current time in the memory only when the current time is ahead of the current time; The broadcast output means outputs, from the receiving device body to the module, viewing expiration date information indicating a viewing expiration date or a viewing period of the encrypted pay broadcast program stored in the storage means, and the encrypted pay broadcast program. Outputting a decryption key in which a decryption key for decrypting the signal of the pay broadcast program is encrypted, and program start time information indicating an absolute program start time of the pay broadcast program; and a key means provided in the module. By decrypting the encrypted decryption key input from the information output means, to generate a decryption key for decrypting the encrypted pay broadcast program,
By the decryption key means provided in the module, the current time input from the clock means is ahead of the current time input from the memory, and the current time input from the clock means is Outputting the decryption key generated by the key means from the module to the receiving device main unit only when the time is within the range of the program start time information. .

Further, in the present invention, (17) the encrypted pay broadcast program is stored in the receiving apparatus main body, and the receiving apparatus main body generates the storing means for storing the encrypted pay broadcast program. Clock means for outputting a current time to the module, viewing time limit information indicating a viewing time limit or a viewing time limit of the encrypted pay broadcast program stored in the storage means from the receiving device main body to the module; Information output means for outputting an encrypted decryption key in which a decryption key for decrypting the signal of the encrypted pay broadcast program is encrypted, and a module of the pay broadcast program which is separable from the receiving device body. A module for use in a receiving device for controlling permission / prohibition of reproduction / viewing, wherein the memory is nonvolatile with respect to a power supply for storing the current time;
Only when the current time input from the clock means is ahead of the current time stored in the memory, the current time input from the clock means is stored in the memory as a new current time. Current time updating means, key means for decrypting the encrypted decryption key input from the information output means, and generating a decryption key for decrypting the encrypted pay broadcast program, and the clock The current time input from the means is ahead of the current time input from the memory, and the current time input from the clock means is in accordance with the viewing expiration information input from the information output means. Outputting the decryption key generated by the key unit from the module to the receiving device main body only when the viewing expiration date or the viewing period is within the range. Providing a module which is characterized by comprising a decoding key means.

[0039]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The term "module" used in this specification constitutes a part of a function in a pay broadcast receiving apparatus which receives a storage service, and includes, for example, an IC, a hybrid circuit module, an IC card. , A device, a chip hardened with resin, etc., and generally has a structure that cannot be physically accessed from the outside by packaging or encapsulation, that is, a tamper-resistant block function or circuit.

The term “program” used in this specification
The term includes not only programs composed of video and audio but also all storage services provided to viewers, such as data broadcast programs and programs transmitted by data broadcast.

(First Embodiment) Hereinafter, a first embodiment of a broadcast receiving apparatus according to the present invention will be described in detail with reference to FIGS.

FIG. 1 is a block diagram showing a broadcast receiving apparatus. FIG. 2 is a diagram illustrating an example of a transmission signal transmitted from a broadcast station to a broadcast receiving device. FIG. 3 is a diagram illustrating an example of interface data between the receiving device main body and the module. FIG. 4 is a diagram showing a flowchart of the processing in the module.

Although the broadcast receiving apparatus will be described with reference to FIG. 1, a description of functions not related to the present invention will be omitted.

In FIG. 1, the broadcast receiving apparatus 1 includes a receiving apparatus main body 100 for realizing a basic part of a receiving function, and a module 151 for realizing a pay broadcast receiving control function. In the present embodiment, an IC card is used as the module 151.

The control circuit 111 and the module control circuit 153 are provided between the receiver main body 100 and the module 151.
Necessary data is transmitted and received between the I / Fs (interfaces) 112 and 152 between them. For example, the ECM data and the time data are transmitted from the receiving apparatus main body 100 to the module 1
51, from the module 151 to the receiving device body 10
To 0, descrambling key information is sent.

A terminal 101 receives a broadcast signal obtained by frequency down-converting a signal received by an antenna and supplies the broadcast signal to a tuner circuit 102.

The tuner circuit 102 performs signal selection, demodulation, and data error correction processing on the signal input from the terminal 101, and outputs a packet format signal to the accumulation control circuit 103. Generally, a broadcast signal uses QPSK modulation or 8-phase PSK, and a Reed-Solomon error correction code, a convolutional code, or the like is used as an error correction method. The packet format data output to the storage control circuit 103 generally uses the ISO13818-1 standard (MPEG2 system standard) and includes a plurality of programs and control data.

The storage control circuit 103 outputs a packet format signal input from the tuner circuit 102 to the storage device 104 when storing a program. When viewing a program in real time or reproducing / viewing a program once stored in the storage device 104, the storage control circuit 103 sends the packet format signal input from the tuner circuit 102 or the storage device 104 to the descrambler 105. Output.

The storage device 104 records a signal from the storage control circuit 103 and outputs a signal reproduced from the storage device 104 to the storage control circuit 103. The storage device 1
As a method of storing data in the program data 04, there is a method based on a packet data format, a method of appropriately converting packet data, and the like. Both the program data and the control data multiplexed with the program data are stored in the storage device 104. It is memorized. The storage device 104 requires a large storage capacity, and a hard disk is generally used.

The descrambler 105 includes the storage control circuit 1
The signal in the packet format input from the receiver 03 is descrambled and output to the decoder circuit 106. The descrambler 105 is a circuit for descrambling the pay program, and the free program is generally not scrambled, so that the signal input from the storage control circuit 103 is not descrambled. Is output to the decoder circuit 106 as it is.

The decoder circuit 106 includes the descrambler 1
The broadcast signal separation processing and the video / audio signal decoding processing are performed on the signal input from the input unit 05 and output to the display circuit 107.

The display circuit 107 superimposes, on the decoded video / audio signal input from the decoder circuit 106, characters, graphics, and the like for performing a display interface with a user, such as an operation menu and a message, and modulates the TV signal. After that, the image is output to a TV receiver (not shown) via a terminal 108.

Thus, the user can view / use the program.

The decoder circuit 106 separates control data such as program information and time data multiplexed from the signal input from the descrambler 105 into the control circuit 11.
Output to 1. The control circuit 111 uses this control data as control information for program selection and the like.

Further, the decoder circuit 106 separates ECM data including billing information of a program multiplexed on the signal input from the descrambler 105 and key information for descrambling the pay program from the control circuit. Output to 111.

The key input circuit 115 provides an operation interface for the user, and outputs to the control circuit 111 selection contents such as program selection by the user.

The control circuit 111 outputs program information included in the control data input from the decoder circuit 106 to the display circuit 107. The display circuit 107 includes a control circuit 111
An electronic program guide or the like for the user is created and multiplexed using the program information input from the terminal and output to the terminal. The user selects a program to view by operating the key input circuit 115 using an electronic program guide displayed on a TV receiver (not shown) connected to the terminal 108.

The control circuit 111 includes a tuner circuit 102,
By controlling the decoder circuit 106 and the like, the program selected by the user by operating the key input circuit 115 is output to the terminal 108.

The control circuit 111 outputs the ECM data input from the decoder circuit 106 to the module control circuit 153 in the module 151 when the program selected for viewing by the viewer is a pay broadcast.

The module control circuit 153 includes the control circuit 1
Then, the contents of the ECM data input from 11 and the contents of the contract information memory 157 are compared to determine whether or not viewing is possible.

In a pay broadcast, the broadcast signal is scrambled. If the module control circuit 153 determines that viewing is possible, the module control circuit 153 outputs to the control circuit 111 a descrambling key for descrambling. . The control circuit 111 is a module control circuit 1
The descramble key input from 53 is output to the descrambler 105.

The descrambler 105 includes the storage control circuit 1
The scrambler applied to the program input from the control circuit 111 is descrambled using the descrambling key input from the control circuit 111 and output to the decoder circuit 106. This allows the viewer to view the descrambled program.

In general, contract information is transmitted by broadcasting from a broadcasting station as EMM data, and each receiving apparatus receives its own EMM data using its own ID, and receives the contract information memory 1
The contract information is set in 57. The operation of updating the contract information using the EMM data is not directly related to the present invention, and a description thereof will be omitted. It is assumed that the contract information has already been set in the contract information memory 157.

The telephone modem 113 is a modem for performing two-way communication with a broadcasting station via a telephone line. Generally, when a program to be charged after viewing is viewed, the viewing history data of the program to be charged after viewing is stored in a viewing history memory (not shown) in the module 151. Telephone modem 11
Reference numeral 3 is used to transmit the viewing history data stored in the viewing history memory from the broadcast receiving device 1 to a broadcasting station, for example, once a month for charging.

The programs to be charged after viewing include those which are charged when the program once recorded in the storage device 104 is reproduced.

Also, in addition to sending viewing history data of a program to be charged after viewing using a telephone line, a descrambling key and viewing expiration information of a pay program stored in the storage device 104 are transmitted.
The broadcast can be transmitted from the broadcast station to the broadcast receiving device 1.

The clock 116 is a clock provided in the receiving apparatus main body 100. The time of the clock 116 is calibrated by the control circuit 111 as appropriate, using time data in the control data input from the decoder circuit 106. The time of the clock 116 is transmitted to the module 1 via the control circuit 111.
The data is sent to the module control circuit 153 in the memory 51, subjected to appropriate processing, and stored in the time memory 154. The time memory 154 is constituted by a nonvolatile memory. The non-volatile memory is a memory in which contents are stored when power is shut off from outside the module 151. Generally, an EEPROM is used. However, the EEPROM has a property that the life of the number of times of writing is relatively short.

The program information memory 155 is a memory for storing information of programs purchased and stored in the storage device 104, and stores contents to be described later as data. Generally, since the contents need to be stored, a non-volatile memory is used.
When used, there is a case where program information is temporarily obtained from the receiving apparatus main body 100 and processed using a memory that temporarily stores the information.

The work memory 156 is a memory for storing data for temporarily storing program information, and stores the contents described later as data. Generally, a RAM is used.

Hereinafter, a signal of a pay broadcast program transmitted from the broadcast station to the broadcast receiving apparatus 1 will be described in detail with reference to FIG.

FIG. 2 is a diagram showing a part of a pay broadcast program signal transmitted from the broadcast station to the broadcast receiving apparatus 1. The signal shown in FIG. 2 is stored in the storage device 104 in the broadcast receiving device 1.
Is a signal which is temporarily stored in the storage device 104 and is reproduced from the storage device 104 at the time of storage reproduction or a signal equivalent to apparent reproduction.

The signal shown in FIG. 2 is an encrypted EC
M data packet 201, scrambled program data packet 2 indicating data packet of scrambled program
02 and includes key information and program-related information for descrambling the scrambled program.

The encrypted ECM data packet 201 is used for descrambling the program number 203 for identifying the program to be transmitted, the transmission time 204 indicating the time when the signal was transmitted from the broadcasting station, and the signal of the scrambled program data packet 202. , A program data descramble key 205, a program viewing start time 206 indicating a time when the program can be viewed, and a program viewing time limit 207 indicating a period or a time limit during which the program can be viewed.

The example shown in FIG. 2 shows an example composed of a plurality of encrypted ECM data packets 201. Generally, the key is periodically changed for scrambling. In response to this change, a plurality of encrypted ECM data are multiplexed and transmitted by the packet method. However, if the scramble key is not changed, it is not necessary to transmit the key several times, and the key may be transmitted only once.

When the time transmitted from the broadcasting station is set to a time at which viewing can be started, the transmission time 204
May be used as the program viewing start time 206.

The broadcasting station has a program data descramble key 205, a program viewing start time 206, and a program viewing deadline 20.
7 is not multiplexed with the broadcast signal and transmitted, for example, a program stored in advance is reproduced from the storage device 104, and when the program is purchased, bidirectional communication is performed via a telephone line. May be transmitted.

Hereinafter, when the program once stored in the storage device 104 is reproduced and viewed, the reception device main body 100 and the module 15
The data transmitted / received between one will be described in detail with reference to FIG.

FIG. 3 shows a case where the program once stored in the storage device 104 is played back and watched,
FIG. 5 is a diagram illustrating an example of data transmitted and received between the communication devices 51;

FIG. 3A shows command data sent from the control circuit 111 in the main unit 100 to the module control circuit 153 in the module 151. FIG.
(B) shows a module 15 with respect to the data of FIG.
1 to the receiving device main unit 10
This is response data returned to the control circuit 111 within 0.

When a plurality of ECM data are arranged in time series in a program stored in the storage device 104, the receiving device main body 100 issues command data to the module 151 a plurality of times. In some cases, there is only one ECM data depending on the program. In this case, the command data is issued once at the start of program viewing.

The command data shown in FIG. 3A includes a command number 301, a viewing start flag 302, a current time 303,
It is composed of encrypted ECM data 304.

The command number 301 in FIG. 3A indicates the type of data to be transmitted and the content of an instruction to the module 151. In this example, the command number 301 is the storage device 10
4 indicates that the program has been viewed from the
This shows that the CM data 304 is decrypted and the decrypted program descramble key is requested to the module 151.

The viewing start flag 302 in FIG. 3A is a flag that is set at the start of the reproduction and viewing of the program reproduced from the storage device 104.

The current time 303 in FIG. 3A is the current time, and is the value of the clock 116 in the receiving apparatus main body 100.

The encrypted ECM data 304 shown in FIG.
Is the encrypted ECM data reproduced together with the program reproduced from the storage device 104.

The current time 303 shown in FIG.
The encrypted ECM data 304 of (A) is always sent to the module as a set.

Command data including these four data is given from the receiving apparatus main body 100 to the module 151,
The module 151 performs processing based on the given command data. When the program reproduced from the storage device 104 is viewable, the program data shown in FIG. 3B, which is a key for descrambling the program as response data, is used. The scramble key 305 is output to the receiving apparatus main body 100. Conversely, when viewing is not possible, the program descrambling key 305 is not output to the receiving apparatus main body 100. For this reason, when viewing is not possible, the receiving apparatus main body 100 cannot descramble the program reproduced from the storage device 104, and cannot view the program reproduced from the storage device 104.

In this example, the program descrambling key 305 is not output to the receiving apparatus main body 100 for the sake of simplicity, but an error code or the like is generally output to the receiving apparatus main body 100.

Hereinafter, the processing in the case where the command data shown in FIG. 3 is received in the module control circuit 153 will be described in detail with reference to FIGS. 4 and 9A.

FIG. 4 is a diagram showing processing in the module control circuit 153 when the command data shown in FIG. 3 is received.

In FIG. 4, the module control circuit 153
Receives the command data shown in FIG. 3A from the receiving device main body 100 (the control circuit 111 therein) (step 4).
01).

Next, the module control circuit 153 decrypts the encrypted ECM data 304 in the command data input from the receiving apparatus main body 100 (step 402).

Next, the module control circuit 153 reads the time data stored in the time memory 154 in the module 151, and stores the time indicated by the time data as the time T
(Step 403).

Next, the module control circuit 153 determines whether or not the current time 303 included in the command data input from the receiving device main body 100 is greater than the time T (whether it is advanced) (step 404). .

In step 404, the current time 303
Is greater than the time T, it is determined that the correct (not illegal) current time 303 has been input from the receiving apparatus main body 100 to the module 151.
It is determined whether or not the value of the current time 303 input from 0 is equal to or less than the value of the program viewing time limit 207 in the ECM data (step 405).

Conversely, in step 404, when the current time 303 is not greater than or equal to the time T, the viewing time has returned to the past (the value of the current time 303 has been incorrectly returned to the past) or the clock is stopped. It is determined that it has been performed, and the process ends without outputting the descrambling key to the receiving device main body 100.

At step 405, the receiving device main unit 1
When the value of the current time 303 input from 00 is equal to or less than the value of the program expiration date 207 in the ECM data, it is within the program expiration date, and the program number 2 is stored in the program information memory 155.
It is determined whether or not the program number corresponding to 03 is stored (step 406).

Here, a table created in the program information memory 155 will be described. When a pay program is purchased, a table shown in FIG. 9A is created in the program information memory 155. In step 406, the program number corresponding to the program number 203 reproduced from the ECM data is
The determination is made based on whether or not it already exists in the table shown in FIG.

Returning to FIG. 4, the description will be continued.

On the other hand, in step 405, the value of the current time 303 input from the
If the value is larger than the value of the program viewing time limit 207 in the M data, the viewing time limit has been exceeded.
The program number 203 is deleted from 55 (the program with this program number 203 is deleted from the table shown in FIG. 9A).
Is performed (step 408), and the process proceeds to step 410.

At step 406, the program number corresponding to the program number 203 is stored in the program information memory 155 (the program number corresponding to the program number 203 already exists in the table shown in FIG. 9A). Sometimes the process proceeds to step 409.

Conversely, if the program number corresponding to the program number 203 is not stored in the program information memory 155 in step 406, the program number 203 is newly registered by storing it in the program information memory 155 (step 406). 408), and proceed to step 409.

In step 409, the module control circuit 153 outputs the program descramble key 205 in the decrypted ECM data to the receiving apparatus main body 100, and performs a process for viewing.

Next, the time memory 154 in the module is updated. The time memory 154 is updated only when the value of the current time 303 input from the receiving apparatus main body 100 is larger than the time T to be stored (advancing). Is updated to the current time 303 input from the receiving apparatus main body 100.

That is, it is characterized in that the value of the time memory 154 does not return, and cannot return to the past.

As described above, the time memory 154 in the module 151 forms an apparently irreversible clock, and the viewing control is performed with reference to the clock. As a result, the viewer intentionally resets the clock 116 in the receiving device main body 100 to the past, in order to semipermanently view the program that can be viewed with a time limit stored in the storage device 104,
Even if it is stopped, this fraud can be detected and the viewer cannot watch this program.

(Second Embodiment) Hereinafter, a second embodiment of the broadcast receiving apparatus according to the present invention will be described with reference to FIG.

The second embodiment is different from the first embodiment in that the transmission time 204 in the ECM is advanced and the current time 303 shown in FIG. The control is performed depending on whether the time of the clock 116 in the receiving apparatus main body 100 is almost equal.

The configuration of the broadcast receiving apparatus 1, transmission data, and data between the receiving apparatus main body 100 and the module 151 are the same as in the first embodiment, and a description thereof will be omitted. FIG.
The same processing steps as those in FIG. 4 are denoted by the same reference numerals, and description thereof will be omitted.

Hereinafter, the processing when the command data shown in FIG. 3 is received in the module control circuit 153 will be described in detail with reference to FIG.

FIG. 5 is a diagram showing processing in the module control circuit 153 when receiving the command data shown in FIG.

FIG. 5 is different from FIG. 4 in that steps 501 and 502 are inserted between steps 402 and 403.
And that step 503 is inserted between steps 404 and 405.

It is assumed that the receiving apparatus main body 100 issues a command to the module a plurality of times using a plurality of ECM data multiplexed on the program reproduced from the storage device 104.

In step 402, the module control circuit 153 decrypts the encrypted ECM data 304 in the command data input from the receiving apparatus main body 100.

Next, the module control circuit 153 refers to the viewing start flag 302 in the command data and determines whether or not the viewing start flag has been set (step 501).

In step 501, if the viewing start flag is set to indicate the start of reproduction of a program reproduced from the storage device 104, the transmission time 204 in the decoded ECM data is set to Tse, and Is stored in the working memory 156 as Tsc (step 502), and the process proceeds to step 403.

On the other hand, if the viewing start flag has not been set in step 501, the flow advances to step 403.

At step 404, the current time 303
Is greater than the time T, it is assumed that the correct (not illegal) current time 303 has been input from the receiving apparatus main body 100 to the module 151, and the transmission time 204 in the ECM and the received current The relative time at time 303 is compared. If the comparison results are equal (that is, the time advances are substantially equal), the process proceeds to step 405. If not, the current time 303 is determined to be incorrect and the process proceeds to step 410. Proceed (Step 50
3). The comparison of the relative value is based on the received current time−Tsc
Is compared with the transmission time-Tse in the ECM.

The storage in the work memory at step 502 may be performed every time, or may be performed only once at the start of reproduction.

In this example, it is assumed that the two time comparisons match for the sake of simplicity. However, since the two time data include an error, it is sufficient that this equality is equal within a predetermined error range. For example, when the ECM data is every two seconds, the error may be determined to be equal within at least ± 2 seconds.

As described above, receiving apparatus main body 100
The watch control is performed by comparing the relative time change amount between the value of the clock 116 (current time 303 in the command data of FIG. 3A) and the transmission time 204 in the plurality of ECM data. Thus, even if the viewer intentionally semi-permanently views the program that can be viewed with a time limit stored in the storage device 104 and intentionally resets or stops the clock 116 in the receiving device main body 100, Fraud can be detected and the viewer cannot view this program.

(Third Embodiment) Hereinafter, a third embodiment of the broadcast receiving apparatus according to the present invention will be described with reference to FIG.

The third embodiment is different from the second embodiment in that control is further performed based on the viewing start time.

The configuration of the broadcast receiving apparatus 1, transmission data, and data between the receiving apparatus main body 100 and the module 151 are the same as those in the first embodiment, and a description thereof will be omitted. FIG.
The same processing steps as those in FIG. 4 are denoted by the same reference numerals, and description thereof will be omitted.

The processing performed by the module control circuit 153 when receiving the command data shown in FIG. 3 will be described in detail with reference to FIG.

FIG. 6 is a diagram showing processing in the module control circuit 153 when receiving the command data shown in FIG.

FIG. 6 is different from FIG. 4 in that step 601 is inserted between steps 404 and 405.

In step 404, the current time 303
Is greater than the time T, the correct (not fraudulent) current time 303 is assumed to have been input from the receiver main body 100 to the module 151, and the decoded ECM
The program viewing start time 206 in the data is compared with the current time 303 in the command data, and the value of the current time 303 is
If the time is equal to or more than the value of the program viewing start time 206 in the ECM data (the time is equal or advanced), it is correct and it is determined that viewing is possible, and the process proceeds to step 405. Proceed to step 410.

As described above, the viewing control is performed by comparing the program viewing start time 206 in the ECM data with the current time 303 in the command data. Thus, even if the viewer intentionally semi-permanently views the program that can be viewed with a time limit stored in the storage device 104 and intentionally resets or stops the clock 116 in the receiving device main body 100, Fraud can be detected and the viewer cannot view this program.

(Fourth Embodiment) Hereinafter, a broadcast receiving apparatus according to a fourth embodiment of the present invention will be described in detail with reference to FIGS.

In the fourth embodiment, when a program reproduced from the storage device 104 is purchased, program-related information is obtained not by broadcasting but by telephone line, and information relating to the program is obtained from the program-related information in the module 151. Program information memory 1
55. In this example, module 15
1 is stored in the program information memory 155 in the receiving apparatus 100. A part or all of the information is stored in the memory in the receiving apparatus main body 100, and a part or all of the information is stored in the receiving apparatus main body 100 in an overlapping manner. Is also good. Also, in this example, the description will be made assuming that the program-related information is obtained through a telephone line.
Transmission may be performed using a broadcast signal as in the first embodiment.

The structure of the broadcast receiving apparatus 1 is the same as that of the first embodiment, and the description is omitted.

FIG. 7 is a diagram showing an example of transmission data transmitted from the broadcasting station to the main unit 100 of the receiving apparatus.

FIG. 8 is a diagram showing an example of interface data between the receiving apparatus main body 100 and the module 151.

FIG. 9B is a diagram showing an example of program information stored in the program information memory 155 in the module 151.

FIGS. 10 and 11 are flowcharts of the processing in the module 151, showing the operations at the time of purchase and at the time of viewing and listening to the program reproduced from the storage device 104, respectively.

Hereinafter, the signal of the pay broadcast program transmitted from the broadcast station to the broadcast receiving apparatus 1 will be described in detail with reference to FIG.

FIG. 7 is a diagram showing a part of a signal of a pay broadcast program transmitted from the broadcast station to the broadcast receiving apparatus 1, and FIG.
Only the portions different from the above will be described with different numbers. In FIG. 7, the encrypted ECM data packet includes a program number 203, a transmission time 204, a descrambling key pointer 7
2 is different from FIG.

A descrambling key pointer 701 in the encrypted ECM data packet 201 is a pointer for designating a descrambling key when descrambling a data packet of the same program with a plurality of keys. More specifically, the descrambling key pointer 701 designates which of the 13 descrambling keys A to M904 shown in FIG. 9B is to be used.

When one descramble key of the same program is operated, the descrambling key pointer 701 is not necessary, and the program information stored in the program information memory 155 in the module 151 is also shown in FIG. It becomes street.

[0141] Regarding three pieces of information such as a program data descramble key for descrambling a program, a program viewing start time, and a program viewing expiration date, when a viewer purchases a program reproduced from the storage device 104, the telephone modem In addition to performing bidirectional communication with the broadcast station via 113 and charging for program purchase, the program is transmitted from the broadcast station to the broadcast receiving apparatus 1 and finally stored in the program information memory 155 in the module 151 as shown in FIG. Is stored as shown in FIG.

Depending on the operation method of the billing method, the program data descramble key, the program viewing start time, and the program viewing
The two pieces of information may be arranged and transmitted in encrypted ECM data in a broadcast signal.

Hereinafter, data transmitted and received between the receiving apparatus main body 100 and the module 151 when the program once stored in the storage device 104 is viewed will be described in detail with reference to FIG.

FIG. 8 shows the receiving apparatus body 100 and the module 1
An example of command data and response data between 51 is shown.

FIGS. 8A1 and 8A2 show the storage device 10
4 shows command data and response data when a program not yet purchased is newly purchased.

FIGS. 8B1 and 8B2 show the storage device 10
4 are command data and response data for reproducing and viewing a program that has already been purchased.

When a viewer newly purchases an unpurchased program stored in the storage device 104, bidirectional communication is performed with the broadcast station via a telephone line, and charging is performed, and program-related information is obtained from the broadcast station. Thereafter, the command data shown in FIG. 8A1 is issued from the receiving apparatus main body 100 to the module 151.

When the viewer plays and views the already purchased program stored in the storage device 104, the arrangement in which the encrypted ECM data packet included in the reproduced signal is inserted, The command data shown in FIG. 8 (B1) is issued a plurality of times.

The command number 801 in FIG. 8A is a number for identifying a command instructing the purchase of a program stored in the storage device 104. The module 151 identifies the command number 801 and purchases the program. Perform processing.

The current time 802 in FIG. 8 (A1) is the current time, and is the value of the clock 116 in the receiving apparatus main body 100.

The encrypted ECM data 803 shown in FIG.
Is encrypted ECM data transmitted and stored.

The encrypted descrambling key data A to M804 in FIG. 8A1 are key information for descrambling a program. In the example of FIG. 8, a plurality of key data can be set. However, when one descramble key data is used in one program, only one key data may be used.

The encrypted viewing start time data 806 in FIG. 8 (A1) is obtained by encrypting the start time at which a program can be viewed.

The encrypted viewing time limit data 80 shown in FIG.
Reference numeral 7 denotes an encrypted term or period during which the program can be viewed.

In this embodiment, the encrypted descramble key data A to M804, the encrypted viewing start time 806, and the encrypted viewing expiration date data 807 are information obtained from a broadcasting station via a telephone line when a program is purchased.

The program descramble key 808 of the response data shown in FIG. 8 (A2) is used to send a program from the module 151 when the program can be purchased and viewed.
This is key information for descrambling the program sent to the “0”. If viewing is not possible immediately with the command data shown in FIG. 8 (A2) but viewing is made by issuing the command data shown in FIG. 8 (B1), this FIG. 8 (A2)
It is not necessary to output the program descramble key 808 with the response data shown in FIG.

The command data shown in FIG. 8B1 and the response data shown in FIG.
And the response data shown in FIG. 3B.

However, unlike the encrypted ECM data 304 shown in FIG. 3A, the encrypted ECM data 803 shown in FIG. 8B1 of this embodiment is different from the program data descramble key 205 and the program viewing start time. 206, does not include the program viewing time limit 207, but instead includes the descramble key pointer 701 shown in FIG.

FIG. 9B is a diagram showing an example of program information stored in the program information memory 155 in the module 151.

FIG. 9B is an example of a table stored for a total of N programs (1) to (N).

In this embodiment, when a program is purchased, the program information of the purchased program is stored in the program information memory 155.

Program numbers Pr (1) to (N) in FIG. 9B
Reference numeral 901 denotes a program number of a purchased stored program.

The viewing start time Tsrt (1) in FIG. 9B
（(N) 902 is a time at which viewing of the program can be started.

The viewing expiration time Tend (1) shown in FIG.
（(N) 903 indicates a time limit for viewing.

The descrambling keys A to M90 shown in FIG.
Reference numeral 4 denotes a plurality of keys for descrambling a program. When one descramble key is used for one program, one descramble key may be used.

FIG. 10 shows the state of FIG.
When the command data shown in 1) is issued from the receiving apparatus main body 100 to the module 151, the module 151
6 is a flowchart showing the operation of the first embodiment.

In FIG. 10, module control circuit 15
3 receives the command data shown in FIG. 8 (A1) from the receiving device main body 100 (the control circuit 111 therein) (step 1001).

Next, the module control circuit 153 transmits the encrypted data (ECM data 8) in the command data shown in FIG.
03, encrypted descrambling key data A to M804, encrypted viewing start time data 806, and encrypted viewing expiration date data 807) are decrypted (step 1002).

Next, the module control circuit 153 reads the time data stored in the time memory 154 in the module 151, and stores the time indicated by the time data as the time T
(Step 1003).

Next, the module control circuit 153 determines whether or not the current time 303 included in the command data input from the receiving apparatus main body 100 is greater than the time T (whether it is advanced) (step 1004). .

At step 1004, the current time 30
3 is greater than the time T, the correct (not illegal) current time 303 is assumed to have been input from the receiving apparatus main body 100 to the module 151, and the decoded EC
It is determined whether or not a table of the program number indicated by the program number 203 shown in FIG. 7 in the M data exists in the program information memory 155 (step 1005). That is, it is determined whether or not the program to be purchased has already been purchased.

Conversely, if the current time 303 is not greater than or equal to the time T in step 1004, the viewing time has returned to the past (the value of the current time 303 has been incorrectly returned to the past) or the clock has been stopped. It is determined that it has been performed, and the process ends without outputting the descrambling key to the receiving device main body 100.

If the program already exists in step 1005, the program to be purchased has already been purchased, and the flow advances to step 1006.

On the other hand, if the program does not exist in step 1005, the program to be purchased has not been purchased, so program number 901 (program number 203 in the decoded ECM data in FIG. 7), viewing Start time 902
(Decrypted encrypted viewing start time data 806 shown in FIG. 8 (A1)), viewing deadline time 903 (decrypted FIG.
(A1) encrypted viewing expiration time data 807),
The descrambling keys A to M904 (FIG.
Scramble key data A to M80 in the encryption shown in 1)
4) is additionally stored in the table shown in FIG. 9B of the program information memory 155 (step 1006).

Next, the module control circuit 153 outputs the program descramble key 808 in the decrypted ECM data to the receiving apparatus main body 100, and performs a process for viewing (step 1009).

Next, the time memory 154 in the module is updated. The time memory 154 is updated only when the value of the current time 303 input from the receiving apparatus main body 100 is larger than the stored time T (advanced). Of the current time 8 shown in FIG.
Update to 02.

That is, the value of the time memory 154 does not return and cannot return to the past.

The program information of the purchased program (FIG. 9)
(B), the program number 901, the viewing start time 902, the viewing expiration time 903, and the descrambling key A to M904) are stored in the program information memory 155 and stored in the storage device 104 under conditions based on the program information. It is possible to play and watch the selected program.

In step 1009, after the program purchase processing, the program descramble key is output. However, if the program is not viewed immediately, the output may not be performed.

FIG. 11 shows the state of FIG.
When the command data shown in (B1) is issued from the receiving apparatus main body 100 to the module 151, the module 1
FIG.

This processing corresponds to the program number 901 stored in the program information memory 155 shown in FIG.
2, viewing expiration time 903, descrambling keys A to M90
4 is performed.

In FIG. 11, module control circuit 15
3 receives the command data shown in FIG. 8 (B1) from the receiving apparatus main body 100 (the control circuit 111 therein) (step 1101).

Next, the module control circuit 153 decrypts the encrypted ECM data 803 in the command data shown in FIG. 8 (B1) input from the receiving apparatus main body 100 (step 1002).

Next, the module control circuit 153 operates as shown in FIG.
The viewing start flag 30 in the command data shown in (B1)
With reference to FIG. 2, it is determined whether or not the viewing start flag is set (step 1103).

In step 1103, if the viewing start flag is set to indicate the start of reproduction of the program reproduced from storage device 104, the transmission time 204 in the decoded ECM data is set to Tse, Is stored in the working memory 156 as Tsc (step 1104), and the process proceeds to step 1105.

Conversely, if the viewing start flag is not set in step 1103, step 1105
Proceed to.

Next, the module control circuit 153 reads the time data stored in the time memory 154 in the module 151, and stores the time indicated by the time data as the time T
(Step 1105).

Next, the module control circuit 153 determines whether or not the current time 303 included in the command data shown in FIG. 8B1 input from the receiving apparatus main body 100 is greater than the time T (whether it is advanced). (Step 1
106).

If the current time 303 is greater than the time T in step 1106, it is determined that the correct (not illegal) current time 303 has been input from the receiving device main body 100 to the module 151, and the program number is stored in the program information memory. It is determined whether or not it exists in the table shown in FIG. 9 stored in 155 (step 1107).

On the other hand, if the current time 303 is not greater than or equal to the time T in step 1106, the viewing time has returned to the past (the value of the current time 303 has been incorrectly returned to the past) or the clock has been set. It is determined that the process has been stopped, and the process ends without outputting the descramble key to the receiving device main body 100.

At step 1107, if the program number does not exist in the table, the program has not been purchased, so the descrambling is stopped, and the process proceeds to step 1112.

Conversely, in step 1107, if the program number exists in the table, the program has already been purchased, so that the step to the descrambling process is continued, and the ECM is performed based on Tse and Tsc. Is compared with the relative time between the current transmission time 204 and the received current time 303. If the comparison results are substantially equal (that is, the time advance is almost equal), the process proceeds to step 1109; It is determined that the current time 303 is invalid, and the process proceeds to step 1112 (step 1108). The comparison of the relative values is performed by comparing whether or not the received current time-Tsc matches the ECM transmission time-Tse.

At step 1108, when the comparison results are almost equal, the value of the current time 303 shown in FIG. It is determined whether the value is less than or equal to the value of the program viewing expiration date 903 within (step 1109).

In step 1109, receiving apparatus main body 100
When the value of the current time 303 shown in FIG. 8 (B1) input from the table is less than or equal to the value of the program viewing time limit 903 in the table shown in FIG. 9, it is within the viewing time limit. The program descramble keys A to M904 indicated by the descramble key pointer 701 shown in FIG. 7 are output to the receiving apparatus main body 100 (step 1110), and the process proceeds to step 1112.

Conversely, in step 1109, the current time 3 shown in FIG.
The program viewing expiration date 9 in which the value of 03 is in the table shown in FIG.
When the value exceeds 03, the viewing expiration date has been exceeded, so the data relating to the program number in the program information memory 155 is deleted from the table shown in FIG. 9 (step 1111), and the process proceeds to step 1112.

In step 1112, the time memory 154 in the module is updated. Only when the value of the current time 303 input from the receiving apparatus main body 100 is greater than the time T to be stored (advancing), the time memory 154 is updated. The content of 154 is changed to the current time 30 input from the receiving apparatus main body 100.
Update to 3.

That is, it is characterized in that the value of the time memory 154 does not return, and cannot return to the past.

As described above, after determining the validity of the current time in the command data received from the receiving device 100 in steps 1108 and 1109, the module 151 determines whether the ECM data received from the receiving device main body 100 in step 1110. Descramble key pointer 70
1, the descrambling keys A to M904 in the program information memory 155 are output to the receiving apparatus main body 100.

As described above, the time memory 154 in the module 151 forms a clock that is apparently irreversible and refers to it.

[0200] Thereby, the viewer intentionally operates the receiving apparatus main body 1
Even if the user tries to semi-permanently view the stored program with a time limit by returning or stopping the clock 116 in 00 in the past, it is possible to prevent the program from being viewed.

By storing the program information in the module 151, the module 151 can be made portable.

(Fifth Embodiment) Hereinafter, a fifth embodiment of the broadcast receiving apparatus according to the present invention will be described with reference to FIG.

In the fifth embodiment, the module 15
1 is updated with the current time 303 in the command data, the data is written once at a predetermined number of times or once at a predetermined time interval.
It is characterized in that the number of times of writing the current time 303 to the register 54 is reduced.

The configuration of the broadcast receiving apparatus 1, transmission data, and data between the receiving apparatus main body 100 and the module 151 are the first type.
This is the same as the embodiment described above, and the description is omitted. In FIG. 12, the same processing steps as those in FIG. 4 are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 12 is a diagram showing an operation flowchart of the module control circuit 153.

FIG. 12 is different from FIG.
The subsequent steps are different in that steps 1201 to 1205 are performed.

In FIG. 12, at step 405, the value of current time 303 input from
If the program expiration date is larger than the value of the program expiration date 207 in the CM data, the program expiration date has been exceeded, and thus the program number 203 is deleted from the program information memory 155 (from the table shown in FIG. Is deleted) (step 408), and the process proceeds to step 1201.

At step 409, the module control circuit 153 outputs the program descramble key 205 in the decrypted ECM data to the receiving apparatus main body 100 to perform a process for viewing, and proceeds to step 1201.

In step 1201, the working memory 1
The value of the reception counter provided in 56 is incremented.

Next, it is determined whether the value of the reception counter provided in the working memory 156 is larger than a predetermined value (step 1202).

At step 1202, the working memory 1
When the value of the reception counter provided in 56 is larger than a predetermined value, the process proceeds to step 1204.

Conversely, in step 1202, when the value of the reception counter provided in the working memory 156 is not larger than the predetermined value, the current time 303 and the time memory 154 in the command data shown in FIG. The difference from the stored time T is obtained, and it is determined whether or not the difference is larger than a predetermined value (1203).

At step 1203, the current time 30
When the difference between 3 and the time T stored in the time memory 154 is larger than a predetermined value, the process proceeds to step 1204.

On the other hand, if the difference between the current time 303 and the time T stored in the time memory 154 is not larger than the predetermined value in step 1203, the predetermined time has not yet passed, and the time data 154 is stored in the time memory 154. The process is terminated without updating the current time 303.

At step 1204, the working memory 156
Is cleared (step 1204).

Next, the time of the current time 303 in the command data is written and updated in the time memory 154 (step 1205).

As described above, the current time in the time memory 154 is updated each time the number of times the descramble key is output to the receiving apparatus main body 100 reaches the predetermined number in step 1202. For example, the current time is written and updated in the time memory 154 at a rate of once per 100 times for outputting the descramble key to the receiving apparatus main body 100.

As the time memory 154, a nonvolatile memory EEPROM is used, and the EEPROM has a life of about 100,000 write operations. However, by reducing the number of times the current time of the time memory 154 is updated as described above, the life of the time memory 154 can be extended.

In step 1203, the current time in the time memory 154 is updated every time a predetermined time elapses. For example, the current time is written and updated in the time memory 154 once an hour.

The descrambling key is transmitted to the receiving apparatus main unit 1
The effect of reducing the number of times of writing to the time memory 154 can be obtained by using either the process of reducing the number of times of writing according to the number of times of output to 00 or the process of reducing the number of times of writing according to time.

As described above, by counting the number of times command data is received and determining the time, the number of times of writing can be reduced and the life of the nonvolatile memory can be extended.

(Sixth Embodiment) Hereinafter, a sixth embodiment of the broadcast receiving apparatus according to the present invention will be described with reference to FIG.

The sixth embodiment aims at preventing unauthorized use during the period in which the number of times of writing in the fifth embodiment is reduced.

A time memory 154 of a nonvolatile memory is used as a first memory for storing time data, and a working memory 15 is used as a second memory for storing volatile time data.
6, the time data is stored and controlled in the first and second memories.

The working memory 156, unlike the time memory 154, updates (updates) the time without thinning.

The configuration of the broadcast receiving apparatus 1, transmission data, and data between the receiving apparatus main body 100 and the module 151 are the fifth type.
This is the same as the embodiment described above, and the description is omitted. In FIG. 13, the same processing steps as those in FIG. 12 are denoted by the same reference numerals, and description thereof is omitted.

In the present embodiment, a second time memory is provided in the working memory 156.

The working memory 156 is a volatile memory such as a RAM, for example, and has no life in the number of times of writing.

FIG. 13 is a diagram showing an operation flowchart of the module control circuit 153.

FIG. 13 is different from FIG.
4 is that steps 1301 and 1302 are different, that the step to proceed when the judgment result of step 1203 is NO is 1303, and that step 1303 is inserted after step 1205.

In FIG. 13, module control circuit 15
3 reads the time data stored in the time memory 154 in the module 151 and sets the time indicated by the time data as the time T (step 403).

Next, the time data stored in the working memory 156 is read, and the home country indicated by the time data is set as the time Tw (step 1301).

Next, the current time 303 in the command data shown in FIG.
It is determined whether it is greater than both the time T and the time Tw (step 1302).

At step 1302, the current time 303 in the command data shown in FIG.
Correct if w is greater than both (not fraudulent)
The current time 303 indicates that module 1
The processing proceeds to step 405 assuming that the input has been made to the key 51.

On the other hand, in step 1302, FIG.
When the current time 303 in the command data shown in (A) is not greater than or equal to both the time T and the time Tw, the viewing time has returned to the past (the value of the current time 303 has been incorrectly returned to the past). ) Alternatively, it is determined that the clock has been stopped, and the process ends without outputting the descramble key to the receiving device main body 100.

In step 1203, the current time 303
If the difference between the time and the time T stored in the time memory 154 is not larger than the predetermined value, the predetermined time has not yet elapsed, and the time memory 154 is not updated in accordance with the current time 303 in the command data. Proceed to step 1303.

In the step 1303, the working memory 156
In the second time memory in the current time 3 in the command data
03 is written.

That is, the time memory 1 which is a nonvolatile memory
For the memory 54, the data is thinned out once every predetermined number of times and stored, and the time is written each time to the second time memory in the working memory 156 which has no write restriction.

At the time of starting, the time data stored in the time memory 154 and the time data stored in the second time memory in the working memory 156 are used to compare the time data. Thus, for example, when the time data is updated to the time memory 154 only once an hour, for example, when the user stops viewing after 50 minutes from the start of viewing and tries to repeat the reproduction by returning to the beginning, the time memory 154 stores 50 minutes. Although the previous time is stored, since the latest time data is stored in the second time memory in the working memory 156, it is possible to prevent backward reproduction.

As described above, the life of the time memory 154, which is a non-volatile memory, is extended by counting the number of times of reception of command data and determining the time to reduce the number of times of writing to the time memory 154. be able to.

Further, the working memory 15 without any write restriction
Each time the time data is written in the second time memory in the memory 6 and the time data in the time memory 154 and the second time memory in the working memory 156 are referred to, thereby preventing unauthorized use during the thinned time. Can be.

(Seventh Embodiment) FIG. 14 is a diagram for explaining another embodiment for reducing the number of times of writing time data to the nonvolatile memory.

(A) shows the write control information in the working memory 156, (B) shows the configuration of the time memory 154, and the time memory 154 has a plurality of time memory areas and control information. An area is provided.

The counter 1401 in the working memory is a pointer 140 in the time memory area in the time memory 154.
The counter 1401 is incremented each time command data is received, and changes the value of the pointer 1402 of the time memory area in the time memory 154 when the counter 1401 reaches a certain reference value or more. I do.

The pointer 1402 of the time memory area in the time memory 154 indicates a plurality of time memory areas 140
3 is a pointer for writing or referring to 3,
It is changed like a ring. Time reference for module processing,
Upon receiving the command data in the write / update processing, the module control circuit 153 refers to the pointer 1402 of the time memory area in the time memory 154, refers to the time memory area 1403 indicated by the pointer, and reads or reads the time data. Write.

As described above, by providing a plurality of areas of the time memory and performing distributed writing, the number of times of writing time data to the nonvolatile memory can be reduced, and the life of the nonvolatile memory can be extended. Can be.

[0247]

According to the present invention, a system for storing, reproducing and viewing an encrypted pay program includes a separable module in the receiving apparatus, and in the module, time management and control of playback and viewing of the stored program and content decryption. By performing the key control, it is possible to provide a broadcast receiving apparatus, a module used in the apparatus, and a broadcast receiving method for preventing unauthorized use of stored program reproduction.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a broadcast receiving apparatus according to the present invention.

FIG. 2 is a format diagram of a broadcast signal transmitted by the present invention.

FIG. 3 is a format diagram of transmission data between a receiver main body and a module according to the present invention.

FIG. 4 is a flowchart for explaining the operation of the module of the present invention.

FIG. 5 is a flowchart for explaining the operation of the module of the present invention.

FIG. 6 is a flowchart for explaining the operation of the module of the present invention.

FIG. 7 is a format diagram of a broadcast signal transmitted in the present invention.

FIG. 8 is a format diagram of transmission data between a receiver main body and a module according to the present invention.

FIG. 9 is a format diagram showing data in a program information memory in a module according to the present invention.

FIG. 10 is a flowchart for explaining the operation of the module of the present invention.

FIG. 11 is a flowchart for explaining the operation of the module of the present invention.

FIG. 12 is a flowchart for explaining the operation of the module of the present invention.

FIG. 13 is a flowchart for explaining the operation of the module of the present invention.

FIG. 14 is a format diagram showing data in a time memory in a module and a working memory according to the present invention.

FIG. 15 is a system block diagram for explaining a pay broadcast system.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Broadcast receiver, 100 ... Receiver main body, 101 ... Terminal, 102 ... Tuner circuit, 103 ... Storage control circuit, 1
04: storage device, 105: descrambler, 106: decoder circuit, 107: display circuit, 108: terminal, 111
... Control circuit, 112, 152, I / F, 113, telephone modem, 115, key input circuit, 116, clock, 151
Module: 153: module control circuit, 154: time memory, 155: program information memory, 156: working memory, 157: contract information memory.

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) EA22 NA02 NA35 NA37 NA42 PA06 PA11

Claims (17)

[Claims] 1. A receiving apparatus for storing an encrypted pay broadcast program in a main body of a receiving apparatus and controlling whether or not the pay broadcast program can be reproduced / viewed by a module separable from the main body of the receiving apparatus. A storage unit that is provided in the device main body and stores the encrypted pay broadcast program; a clock unit that is provided in the reception device main body and outputs the generated current time to the module; A non-volatile memory for a power supply for storing the current time, and provided in the module, only when the current time input from the clock means is ahead of the current time stored in the memory, Current time updating means for storing the current time inputted from the clock means as a new current time in the memory; and In the table, the viewing expiration date information indicating the viewing expiration date or viewing period of the encrypted pay broadcast program stored in the storage unit and a decryption key for decoding the encrypted pay broadcast program signal are encrypted. Information output means for outputting an encrypted decryption key; provided in the module, for decrypting the encrypted decryption key input from the information output means, for decrypting the encrypted pay broadcast program Key means for generating a decryption key for performing the processing, the current time input from the clock means being provided in the module, being ahead of the current time input from the memory, and being input from the clock means. The module only when the obtained current time is within the range of the viewing period or the viewing period according to the viewing period information input from the information output unit. And a decryption key means for outputting the decryption key generated by the key means to the receiving apparatus main body. 2. The system according to claim 2, wherein said current time updating means has a counting means for counting the number of times the current time has been input from said clock means, and said count value when said count value reaches a predetermined value. The broadcast receiving device according to claim 1, wherein the current time input from a clock means is stored in the memory. 3. The current time update means includes a time difference calculation means provided in the module, for calculating a time difference between the current time input from the clock means and the current time input from the memory, 2. The memory according to claim 1, wherein when the time difference becomes larger than a predetermined value, the current time inputted from the clock means is stored in the memory as a new current time.
A broadcast receiving device according to claim 1. 4. A volatile memory which is volatile with respect to a power supply, and a temporary current time storage means for storing the current time inputted from the clock means in the volatile memory, wherein the current time updating means comprises: Only when the current time input from is ahead of the current time stored in the temporary current time storage means, the current time stored in the temporary memory is changed to the current time input from the clock means. The temporary current time storage means updates the current time input from the clock means when the number of inputs of the current time reaches a predetermined number, or the current time provided in the module and input from the clock means. And when the difference between the current time and the current time input from the memory is greater than a predetermined value, storing the current time input from the clock means. The key unit is configured to execute the module from the module only when the current time input from the clock unit is within the range of the viewing expiration date and is ahead of the viewing expiration date and the time stored in the volatile memory. The broadcast receiving apparatus according to claim 1, further comprising means for outputting a decryption key generated by the key means to the receiving apparatus body. 5. The memory comprises: a plurality of non-volatile memories for storing the current time; and pointer means for outputting a pointer indicating which of the plurality of memories is being used; The broadcast receiving apparatus according to claim 1, wherein the input current time is sequentially written to the plurality of memories according to the pointer input from the pointer means. 6. An encrypted pay broadcast program is stored in a receiving device main body together with absolute or relative program time information indicating an elapsed time of program broadcast, and said pay broadcast program is separated by a module separable from said receiving device main body. A receiving device for controlling whether reproduction / viewing is possible / unavailable, a storage means provided in the receiving device main body for storing the encrypted pay-broadcast program, and a current time generated in the receiving device main body and generated. Clock means for outputting to the module, a memory provided in the module and nonvolatile to a power supply for storing the current time, and the current time provided in the module and inputted from the clock means, Only when the current time stored in the memory is stored in the memory only when the current time is ahead of the stored current time. Updating means, from the receiving device main body to the module, viewing expiration information indicating a viewing expiration time or a viewing period of the encrypted pay broadcast program stored in the storage means, and information of the encrypted pay broadcast program. Information output means for outputting an encrypted decryption key in which a decryption key for decrypting a signal has been encrypted, provided in the module, and decrypting the encrypted decryption key input from the information output means; Key means for generating a decryption key for decrypting the encrypted pay-broadcast program, provided in the module, the degree of advance of the time of the program time information input to the module from the receiving device body, The difference between the current time input from the clock means and the degree of advance of the time is within a predetermined range, and the current time input from the clock means is the information output means. Decryption for outputting the decryption key generated by the key means from the module to the receiving apparatus main body only when the viewing expiration date or the viewing period according to the viewing expiration information input from the stage is within the range. A broadcast receiving apparatus comprising a key unit. 7. A receiving device for storing an encrypted pay broadcast program in a receiving device main body and controlling whether or not the pay broadcast program can be reproduced / viewed by a module separable from the receiving device main body. A storage unit that is provided in the device main body and stores the encrypted pay broadcast program; a clock unit that is provided in the reception device main body and outputs the generated current time to the module; A non-volatile memory for a power supply for storing the current time, and provided in the module, only when the current time input from the clock means is ahead of the current time stored in the memory, Current time updating means for storing the current time inputted from the clock means as a new current time in the memory; and In the table, the viewing expiration date information indicating the viewing expiration date or viewing period of the encrypted pay broadcast program stored in the storage unit and a decryption key for decoding the encrypted pay broadcast program signal are encrypted. Information output means for outputting program start time information indicating an absolute program start time of the pay broadcast program; and the encryption provided in the module and inputted from the information output means. Key means for decrypting a decryption key and generating a decryption key for decrypting the encrypted pay broadcast program; provided in the module, wherein the current time inputted from the clock means is inputted from the memory; Only when the current time is ahead of the current time and the current time input from the clock means is within the range of the program start time information, the module A broadcast receiving apparatus, comprising: a receiving apparatus main body; and a decryption key means for outputting the decryption key generated by the key means. 8. The broadcast receiving device according to claim 1, wherein the decryption key and the viewing expiration information are stored in the storage device. 9. The broadcast receiving apparatus according to claim 7, wherein the decryption key, the viewing expiration information, and the program start time information are stored in the storage device. 10. The broadcast receiving apparatus according to claim 1, wherein the decryption key and the viewing expiration information are stored in the module. 11. The broadcast receiving apparatus according to claim 7, wherein the decryption key, the viewing expiration information, and the program start time information are stored in the module. 12. The broadcast receiving apparatus according to claim 1, wherein at least one of the viewing time limit information and the current time information output from the receiving apparatus main body to the module is encrypted. . 13. The information processing apparatus according to claim 12, wherein at least one of the viewing time limit information, the current time information, and the program start time information output from the receiving device body to the module is encrypted. 8. The broadcast receiving device according to 7. 14. A receiving method in which an encrypted pay broadcast program is stored in a receiving device main body, and whether or not the pay broadcast program can be reproduced / viewed is controlled by a module separable from the receiving device main body. A step of storing the encrypted pay broadcast program by a storage unit provided in the apparatus main body; and a step of outputting the generated current time to the module by a clock unit provided in the receiving apparatus main body. By the current time updating means provided in the module,
Only when the current time input from the clock means is ahead of the current time stored in the nonvolatile memory with respect to the power supply storing the current time, the current time input from the clock means Storing a time in the memory as a new current time; and an information output means, from the main body of the receiving device to the module, to a viewing expiration date or a viewing period of the encrypted pay broadcast program stored in the storage means. And an expiration date information indicating an encrypted decryption key for decrypting a signal of the encrypted pay broadcast program, and outputting an encrypted decryption key.The key means provided in the module, Decrypting the encrypted decryption key input from the information output means and generating a decryption key for decrypting the encrypted pay broadcast program; The present time input from the clock means is ahead of the current time input from the memory, and the current time input from the clock means The decryption key generated by the key unit is output from the module to the receiving apparatus main body only when the viewing period or the viewing period according to the viewing period information input from the information output unit is within the range. Performing the broadcast receiving. 15. An encrypted pay broadcast program is stored in a receiving apparatus main body together with absolute or relative program time information indicating a program broadcast elapsed time, and said pay broadcasting program is separated by a module separable from said receiving apparatus main body. Can play / view
In the receiving method for controlling the impairment, a step of storing the encrypted pay-broadcast program by a storage unit provided in the main body of the receiving device, and a current time generated by a clock unit provided in the main body of the receiving device. Outputting to the module, and the current time updating means provided in the module,
Only when the current time input from the clock means is ahead of the current time stored in the nonvolatile memory with respect to the power supply storing the current time, the current time input from the clock means Storing a time in the memory; and information expiration information indicating an expiration time or an expiration time of the encrypted pay-broadcast program stored in the storage means from the receiving device main body to the module by the information output means. Outputting an encrypted decryption key in which a decryption key for decrypting the encrypted pay broadcast program signal has been encrypted; and inputting from the information output means by a key means provided in the module. Decrypting the encrypted decryption key and generating a decryption key for decrypting the encrypted pay-broadcast program; and decrypting the decryption key provided in the module. The difference between the degree of advance of the time of the program time information input to the module from the main body of the receiving device by the key means and the degree of advance of the time of the current time input from the clock means is within a predetermined range. Only when the current time input from the clock unit is within the range of the viewing period or the viewing period according to the viewing period information input from the information output unit, the module sends the receiving device. Outputting the decryption key generated by the key means to a main body. 16. A receiving method for storing an encrypted pay broadcast program in a receiving device main body and controlling whether or not the pay broadcast program can be reproduced / viewed by a module separable from the receiving device main body. A step of storing the encrypted pay broadcast program by a storage unit provided in the apparatus main body; and a step of outputting the generated current time to the module by a clock unit provided in the receiving apparatus main body. By the current time updating means provided in the module,
Only when the current time input from the clock means is ahead of the current time stored in the nonvolatile memory with respect to the power supply storing the current time, the current time input from the clock means Storing a time in the memory as a new current time; and an information output means, from the main body of the receiving device to the module, to a viewing expiration date or a viewing period of the encrypted pay broadcast program stored in the storage means. , A decryption key in which a decryption key for decrypting the encrypted pay broadcast program signal is encrypted, and a program start time indicating an absolute program start time of the pay broadcast program. Outputting information; and decrypting the encrypted decryption key input from the information output means by a key means provided in the module, and Generating a decryption key for decrypting the transmitted program; and a decryption key means provided in the module, wherein the current time input from the clock means is ahead of the current time input from the memory. And outputting the decryption key generated by the key unit from the module to the receiving device main body only when the current time input from the clock unit is within the range of the program start time information. And a broadcast receiving method. 17. An encrypted pay-broadcast program is stored in a receiving device main body, and the receiving device main body stores the encrypted pay-broadcast program in a storage unit, and outputs the generated current time to the module. Clock means, from the receiving device body to the module, viewing expiration information indicating the viewing expiration date or viewing period of the encrypted pay broadcast program stored in the storage means, and An information output means for outputting an encrypted decryption key in which a decryption key for decrypting a signal is encrypted, and a module separable from the main body of the receiving apparatus controls whether or not reproduction / viewing of the pay broadcast program is possible / unavailable. A non-volatile memory for a power supply for storing the current time, wherein the current time input from the clock means is A current time update unit that stores the current time input from the clock unit as a new current time in the memory only when the current time is ahead of the current time stored by the memory; and an input from the information output unit. Key means for decrypting the encrypted decryption key and generating a decryption key for decrypting the encrypted pay broadcast program; and the current time input from the clock means is input from the memory. While the time is ahead of the current time
Only when the current time input from the clock unit is within the range of the viewing period or the viewing period according to the viewing period information input from the information output unit,
A decryption key unit that outputs the decryption key generated by the key unit from the module to the receiving apparatus main body.