JP4022217B2 - Digital content fraud prevention system - Google Patents

Description

The present invention relates to an unauthorized use prevention system for preventing unauthorized use of digital contents.

  As a method of preventing unauthorized use of this kind of digital content, copy prevention information is recorded in a BCA (Burst Cutting Area) area of the recording medium on which the digital content is recorded, and the digital content on the recording medium is reproduced. When reproducing on the device, the copy prevention information is read, and if the copy prevention information cannot be read (that is, if the digital content is copied to another recording medium), the reproduction is stopped. And digital content that has been subjected to copy control processing and recorded on a recording medium (see Patent Document 1). These are called so-called copy control disks.

JP 2003-346431 A

  However, the former copy control disc has an essential drawback that it may be illegally reproduced because the digital content itself can be copied. Further, since the latter copy control disc prevents the copy of the digital content itself, it has another disadvantage that the digital content cannot be distributed other than selling the copy control disc.

  The present invention was devised in view of the above circumstances, and the object of the present invention is to enable digital content to be copied and to distribute digital content while preventing unauthorized use of the digital content. Another object of the present invention is to provide a method for preventing unauthorized use of digital content and a recording medium on which a program relating to the method for preventing unauthorized use is recorded.

In order to solve the above-mentioned problems, the digital content unauthorized use prevention system according to the present invention is such that the encrypted digital content is missing at least one part of the data string by a bit length different from the decryption bit length. The data body is separated into the data body and the missing data which is the data of the missing part of the digital content, the data body is made continuous by shifting the data string after the missing part, and the digital content Assuming that the business information for identifying the business operator to be distributed is recorded on the recording medium, the recording medium has a first recording unit and a second recording unit. The above data body is transferred to the second storage unit for each decoding bit length, and the data body on the second storage unit is decoded and played back, and the playback device And the distribution of digital content, and a database for missing data in which position information indicating the missing data and which part of the data string of the data body is recorded in advance is connected. And a management unit having a data collection database for recording business operator information in order to promote the communication, and when the management unit receives the request for missing data and the business operator information from the playback device, the management unit responds to the request. The missing data and its position information are read from the missing data database and transmitted to the playback device, while the operator information is recorded in the data accumulation database, and the playback device applies for the user's data body playback. In response to an operation input, the missing data and its position information related to the data body are transmitted to the management means via the communication line. In addition, the operator information added to the data body on the recording medium is read out and transmitted to the management means via the communication line, and the missing data and the position information transmitted from the management means are received accordingly. In order to reproduce the data body, the positional information on the first storage unit is transferred to the second storage unit, and the position of the data body is referred to by referring to the positional information. Recognizing the missing part of the data string and transferring the data body on the recording medium to the second storage unit, while transferring the missing data on the first storage unit to the second storage unit, the second storage On the part, the missing data is combined with the missing part of the data string of the data body, and the combined data is decoded.

  It is preferable that the management unit is configured to tabulate the business operator information recorded on the data accumulation database. When digital content is recorded on a recording medium, the business operator information is preferably stamped on the recording medium.

When the digital content is compressed before being encrypted, the playback device transfers the position information on the first storage unit to the second storage unit to play back the data body, and Referring to the information, the missing part of the data string of the data body is recognized and the data body on the recording medium is transferred to the second storage unit, while the missing data on the first storage unit is transferred to the second storage unit Is transferred to the second storage unit, the missing data is combined with the missing part of the data string of the data body, the combined data is decrypted, and restored from the compressed state to the original state. .

  The bit length of the missing data is different from the divisor of the decoding bit length. When multiple pieces of digital content are dropped, the bit length of missing data × the number of missing places is a bit length different from the divisor of the decoding bit length.

In the digital content fraud prevention system according to claim 1 of the present invention, the encrypted digital content is missing at least one part of the data string by a bit length different from the decryption bit length. It is separated into a data body that is data and missing data that is data of a missing portion of the digital content, and the data body is processed so that a data string after the missing portion is shifted and continuous . . If the digital content is processed in this way, the data string of the data after the missing part of the data body can be different from the data string when encrypted (that is, the data string before being deleted). Therefore, if you try to decrypt the data for each decryption bit length (perform a predetermined calculation) without acquiring the missing data, the data after the missing part will not return to the pre-encrypted data string, and it will be unknown Converted to a numeric or alphanumeric sequence. For this reason, it is not possible to reproduce the data after the missing portion, thereby preventing unauthorized use of the digital content. Moreover, although the digital content has been processed as described above, it is not copy-protected and can be copied. In order to view the copied digital content, it is necessary to acquire missing data. Therefore, while promoting the distribution of digital content, illegal use of the digital content is prevented, and secondary and tertiary of the digital content are prevented. Charges for use can be collected. Further, the operator information transmitted together with the request for missing data from the playback device is recorded in the data collection database of the management means. Therefore, if this business operator information is aggregated, it can be used for cash back, marketing, etc. to the business operator. In other words, it is possible to promote the distribution of digital contents by performing cash back and marketing for businesses.

  In the case of the method for preventing unauthorized use of digital contents according to claim 2 of the present invention, if the management means is allowed to aggregate the business operator information on the data collection database, cash back and marketing to the business can be easily performed. Can do.

  In the method of preventing unauthorized use of digital content according to claim 3 of the present invention, the business operator information is stamped on the recording medium on which the digital content is recorded. For this reason, there is no possibility that the business information on the recording medium is erased when the recording medium receives an impact or the like. Therefore, it is possible to prevent a problem that marketing or the like cannot be performed due to the disappearance of the operator information.

  In the case of the digital content unauthorized use prevention method according to claim 4 of the present invention, the digital content is compressed before being encrypted. For this reason, if it is attempted to sequentially decrypt for each decryption bit length without obtaining missing data, the data sequence of the data after the missing portion is different from the data sequence when encrypted, so an unknown number sequence or Converted to alphanumeric sequence. When the unknown number sequence or alphanumeric sequence is to be restored from the compressed state to the original state, the restoration process is stopped. For this reason, the data after the missing portion cannot be reproduced. Therefore, there is a great merit in preventing unauthorized use of digital content.

  In the digital content unauthorized use prevention method according to claim 5 of the present invention, the bit length of missing data is set to a bit length different from a divisor of the decoding bit length. If the bit length of the missing data is a divisor of the decryption bit length, the data sequence of the data after the missing portion becomes the same data sequence as the encrypted data sequence (i.e., the data sequence before being deleted). This makes it possible to prevent data other than the missing portion of the digital content from being reproduced, and this can be prevented.

  In the method of preventing unauthorized use of digital content according to claim 6 of the present invention, the bit length of missing data × the number of missing portions is a bit length different from a divisor of the decoding bit length. If the bit length of missing data x the number of missing parts is a divisor of the decryption bit length, the same data as the data string when the data string of the data after the missing part is encrypted (that is, the data string before being deleted) This makes it possible to prevent data other than the missing portion of the digital content from being reproduced.

  Hereinafter, a method for preventing unauthorized use of digital contents according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a digital content fraud prevention system for realizing a digital content fraud prevention method according to an embodiment of the present invention, and FIG. 2 is a reproduction processed by a control unit of a reproduction apparatus of the system. FIG. 3 is a flowchart of the program, FIG. 3 is a configuration diagram of the digital content used in the system, (a) is a diagram showing the configuration of the data body of the digital content, (b) is a diagram showing the processing steps of the data body, FIG. Is a flowchart of an authentication and accounting interrupt program processed by the control unit of the management center, FIG. 5 is a flowchart of a user registration interrupt program processed by the control unit of the management center of the system, and FIG. It is a flowchart of the data totalization interruption program processed by the control part of the management center.

  A digital content unauthorized use prevention system 100 shown in FIG. 1 is a system for realizing a method for preventing unauthorized use of digital content 10, and the digital content 10 on a recording medium 110 distributed for the purpose of rental to a user is stored in the system. It is a system that prevents unauthorized use. The rental target is the digital content 10 and not the recording medium 110 itself.

  The system 100 processes the recording medium 110 on which the digital content 10 is recorded and the reproduction program 20 shown in FIG. 2, thereby reproducing the digital content 10 recorded on the recording medium 110. And a management center 130 (management means) that can communicate with the playback device 120 and the communication line α and manages the use of the digital content 10. ing. This will be described in detail below.

  The communication line α is a wired or wireless Internet line such as a digital line such as an optical communication line or an analog line such as a telephone line, or a line that transmits and receives radio signals such as digital broadcasting and satellite broadcasting.

  The recording medium 110 is a DVD, and in the BCA (Burst Cutting Area) area, company information for specifying a company that distributes the recording medium 110 for a fee or free of charge is engraved. In this way, the company information is added to the digital content 10 on the recording medium 110.

  The digital content 10 includes a data body 11 that is data such as music, moving images, still images, texts, games, or software, and a header portion 12 of the data body 11. The header section 12 records reproduction information for reproducing the data body 11, content information such as the content name of the digital content 10, content ID assigned to the data body 11, IP address information of the management center 130, and the like. ing. The header portion 12 is recorded on the recording medium 110 in a state where only reproduction information is encrypted. The reproduction information is an address value or the like to be read first in the data body 11.

  In the data body 11, start position information indicating the start position of the data body 11 is recorded in the first part. The data body 11 is compressed by a well-known compression method such as MPEG, and is well-known encrypted. A part of the data body 11 is lost, the missing part is filled and continued, and the missing data 11a is connected to the rear end. The data is recorded on the recording medium 110 with dummy data having the same bit length added (see FIG. 3). The missing data 11a is transferred to the missing data DB 131 of the management center 130 and recorded together with position information indicating which part of the data body 11 the missing data 11a is. The position information is data indicating the data length and time from the start position information to the missing part.

  The bit length of the missing data 11a is a bit length that is different from the decoding bit length of the decoding process of the playback device 120, and a bit length that is different from a divisor of the decoding bit length. When the data body 11 is dropped at a plurality of locations, the bit length of the missing data 11a × the number of missing portions is set to a bit length different from the divisor of the decoding bit length. For example, when the decoding bit length is 10 bytes (that is, 80 bits), the bit length of the missing data 11a is 7 bytes (that is, 56 bits) that is a bit length other than 10 bytes and its divisor. 13 bytes (ie 104 bits), etc. When the bit length of the missing data 11a is 7 bytes, the data body 11 is not lost at 10 or 20 locations. This is because if the decoding bit length is 10 bytes and the bit length of the missing data 11a is 20 bytes, the data string of the decoding bit length data after the missing portion of the data body 11 causes the missing data 11a to be lost. This is because it is the same before and after deletion, and as a result, the portion after the missing portion of the data body 11 can be reproduced. Further, when 10 missing data 11a having a bit length of 7 bytes is deleted, a data string having a decoded bit length after the 10th missing part of the data body 11 is lost before and after the missing data 11a is deleted. This is because there is a possibility that the portion after the 10th missing portion of the data body 11 is reproduced as a result.

  The management center 130 is a server operated by a person who conducts a business of renting the data body 11 on the recording medium 110 to the user under a contract with the copyright holder of the copyrighted work included in the data body 11. is there. In the figure, 131 is missing data 11a, position information indicating which part of the data body 11 this missing data 11a is, decryption key c1 and digital for decrypting reproduction information included in the header portion 12 of the digital content 10 Missing data DB in which decryption c2 for decrypting the data body 11 of the content 10 is recorded in advance, 132 is a user information DB in which user information such as a user ID and password is recorded, 133 is a control unit such as a computer, 134 is a communication unit for performing communication, 135 is a memory unit such as a hard disk, 136 is a data integration DB in which business information is recorded in order to promote distribution of the digital content 10, and 137 is a reproduction program 20 recorded therein. Player DB.

  The content ID of the digital content 10 corresponding to the missing data 11a is added to the missing data 11a on the missing data DB 131. Using this content ID, the correspondence between the missing data 11a on the missing data DB 131 and the digital content 10 on the recording medium 110 is matched.

  In addition to the basic program such as an operation system as a server, the memory unit 135 includes the authentication and accounting interrupt program shown in FIG. 4, the user registration interrupt program shown in FIG. 5, the data totaling interrupt program shown in FIG. A playback program download interrupt program or the like is recorded. Although the contents of these programs will be described later, since the authentication and accounting interrupt program is processed by the control unit 133, the server performs authentication and accounting in response to a request for the missing data 11a of the playback device 120. The function as the management center 130 for transmitting the missing data 11a and the like to the playback device 120 is exhibited. Note that the memory unit 135 also stores an IP address or the like of a billing center 140 described later.

  The management center 130 is connected not only to the playback device 120 but also to the charging center 140 via a communication line α so as to be able to communicate with each other. This billing center 140 is a well-known server operated by a business operator who collects the rental fee of the data body 11 of the digital content 10 on the recording medium 110 from the user on behalf of the person who operates the management center 130. Therefore, detailed description is omitted.

The playback device 120 is a general-purpose computer used by a user. In the figure, 121 is a control unit such as a CPU, 122 is an output unit such as a monitor or speaker, 123 is an operation unit such as a keyboard or mouse, 124 is a reproduction / copying unit that reads / writes data to / from the recording medium 110, and the like. Reference numeral 125 denotes an auxiliary storage unit ( first storage unit ) such as a hard disk, 126 denotes a main storage unit ( second storage unit ) such as a DRAM, and 127 denotes a communication unit for performing communication connected to the communication line α. .

  In addition to the basic program such as an operation system as a computer, the auxiliary storage unit 125 records the reproduction program 20 shown in FIG. 2 transmitted from the management center 130, the missing data 11a, and the like, as well as the rental period. Information is recorded. The playback program 20 is paid or free software downloaded through the communication line α from the management center 130 on the condition of user registration, and is application software necessary for playing back the digital content 10 on the recording medium 110.

  Although the content of the reproduction program 20 will be described later, as the reproduction program 120 is processed by the control unit 121, the computer decrypts the data body 11 of the digital content 10 for each decoding bit length and reproduces it. It comes to show the function of. Further, the playback device 120 also has a function of transmitting a request for missing data 11a to the management center 130 by processing the playback program 20 on the main storage unit 126.

  Hereinafter, a method for preventing unauthorized use of digital content using the digital content unauthorized use prevention system 100 will be described, and the operations of the management center 130 and the playback device 120 and the contents of each program processed by each control unit will be described. . For convenience of explanation, it is assumed that the data body 11 is missing only at one place.

  First, the user operates the operation unit 123 of his / her own computer (a computer corresponding to the playback device 120 and the playback program 20 shown in FIG. 2 is not downloaded) to the management center 130 via the communication line α. Access and request user registration (that is, search and access via the communication line α). Thereby, the connection between the management center 130 and the computer is established. In response to this request, the management center 130 processes the user registration interrupt program shown in FIG. 5, and transmits data necessary for user registration to the computer (s31). When the computer receives the data, the computer outputs and displays the user registration screen data included in the data on the output unit 122. Thereafter, the user inputs registration data such as name, address, and payment condition “your bank account number or credit card number, etc.” as indicated on the user registration screen through the operation unit 123 of the computer, and communicates this registration data. The data is transmitted to the management center 130 via the line α. Upon receiving the registration data, the management center 130 creates a user ID and password, and registers the user ID and password together with the registration data as user information in the user information DB 132 (s32). By referring to the IP address of the center 140, the user ID, password and the registration data are transmitted to the charging center 140 (s33). The charging center 140 receives the user ID, password, and registration data and records them in the database. Then, data indicating that the registration is completed is transmitted to the management center 130. Upon receiving the data, the management center 130 transmits the user ID and password on the user information DB 132 to the user's computer via the communication line α, assuming that user registration has been completed (s34). Then, the process of the user registration interrupt program is terminated. As a result, the connection between the management center 130 and the computer is disconnected. Upon receiving the user ID and password, the computer outputs a registration completion message to the output unit 122 and displays it on the display. The user ID and password may be entered by the user himself / herself during user registration.

  Thereafter, the user operates his / her computer to access the management center 130 in the same manner as described above, and inputs a request for downloading the reproduction program 20. Then, the user's computer transmits the request to the management center 130 through the communication line α. As a result, a connection between the computer and the management center 130 is established. In response to this request, the management center 130 processes a reproduction program download interrupt program (not shown) on the memory unit 135, reads the reproduction program 20 on the player DB 137, and transmits it to the user's computer via the communication line α. . Then, the reproduction program 20 is downloaded and installed in the auxiliary storage unit 125 of the computer. As a result, the connection between the computer and the management center 130 is cut off, and the computer becomes the playback device 120.

  When the user sets the recording medium 110 in the reproduction / copying unit 124 of the reproduction device 120 and executes the reproduction program 20 on the auxiliary storage unit 125, the reproduction program 20 is processed and the reproduction program is processed. Play list data indicating the playback player and the content being rented included in 20 are displayed and output on the output unit 122. Then, a play list is displayed on the screen of the playback player (s1). That is, the content information included in the header portion 12 of the digital content 10 on which a predetermined flag indicating that the rental is in progress is displayed on the playlist. Then, it is determined whether or not a reproduction operation has been performed through the operation unit 123 based on this playlist (s2).

  If it is determined that the reproduction operation has not been performed, it is determined whether or not a read operation (DISC LOAD operation) of the recording medium 110 has been performed through the operation unit 123 (s3). When the DISC LOAD operation is performed, a content list indicating the digital content 10 that is not being rented is read onto the main storage unit 126 and displayed on the output unit 122 (s4). That is, the content information included in the header portion 12 of the digital content 10 for which a predetermined flag is not raised among the digital content 10 on the recording medium 110 is read onto the main storage portion 126 and displayed on the content list.

  Thereafter, when the user performs an application operation for rental of the digital content 10 on the content list (that is, an application operation for reproduction) (s5), a request for missing data 11a is made. At this time, the playback device 120 outputs and displays the input data screen data included in the playback program 20 on the output unit 122, and inputs rental information such as a user ID, a password, a rental period, and a rental fee through the operation unit 123 to the user. Let On the other hand, the content ID included in the header portion 12 of the digital content 10 for which the rental application operation has been performed, the IP address of the management center 130, and the carrier information recorded in the BCA area are read. Then, referring to the IP address, the input user ID, password, and rental information, and the read content ID and business operator information are added to the request and transmitted to the management center 130 (s6). As a result, a connection between the playback device 120 and the management center 130 is established.

  When the management center 130 receives the request, the management center 130 processes the authentication and accounting interrupt program shown in FIG. Then, the user authentication related to the request is confirmed (s21). That is, the user information of the user is read from the user information DB 132 with reference to the received user ID of the user, and whether or not the user ID and the password match (that is, whether or not the user is a genuine user). Check. At this time, the management center 130 confirms whether or not the user information DB 132 is prepared in advance with an inappropriate person list in which a rental fee non-payment or the like is not less than a predetermined amount, and is not a person corresponding to the inappropriate person list together with the authentication. (Confirmation of this inappropriate person list is optional).

  When the management center 130 confirms that the user involved in the application is an unauthorized user or a genuine user but falls under the inappropriate person list, the management center 130 transmits data indicating that the user application is rejected to the communication line α. (S22). Then, the authentication and accounting interrupt program is terminated. As a result, the connection between the playback device 120 and the management center 130 is disconnected.

  On the other hand, when it is confirmed that the user involved in the application is a genuine user and does not correspond to the inappropriate person list, the rental information is added to the user information on the user information DB 141 of the user with reference to the user ID of the user. The rental fee data included in the data is recorded as billing data (s23), and the billing data is transferred to the billing center 140 together with the user ID and password (s24). On the other hand, the content ID, the provider information, and the rental information are collected as data. Record in DB 136 (s25) Upon receipt of the billing data, the billing center 140 records the billing data in the database with reference to the user ID and password. Then, data indicating that charging has been completed is transmitted to the management center 130. When the management center 130 receives the data, it reads the missing data 11a, the position information, and the decryption keys c1, c2 from the missing data DB 131 with reference to the content ID, and retrieves the missing data 11a, the position information, and the decryption keys c1, c2. It transmits to the reproducing | regenerating apparatus 120 with rental information as an acceptance of a user's application (s26). As a result, the connection between the playback device 120 and the management center 130 is disconnected.

  For billing, the billing center 140 collects billing data recorded in the database sequentially or every predetermined period, and bills the bank / card company, or bills the user directly and transfers it to the user, a convenience store, etc. To make payments. Further, when the charging center 140 is connected to the bank / card company via the communication line α, it is of course possible to make an immediate settlement.

  When receiving the data indicating that the application is rejected from the management center 130 via the communication line α (s7), the playback device 120 displays and outputs the error message data included in this data on the output unit 122 (s8). On the other hand, when the missing data 11a, position information, decryption keys c1, c2 and rental information are received via the communication line α (s7), a predetermined flag is set, while the missing data 11a, position information, decryption keys c1, c2 are set. The rental information is recorded in a predetermined registry of the auxiliary storage unit 125 (s9). At the same time, the reception date and time of the missing data 11a is recorded in the auxiliary storage unit 125 using the clock function of the computer. Then, the playlist is read out and updated on the main storage unit 126 and displayed on the output unit 122 (s1). Thereby, the content information of the digital content 10 from which the missing data 11a is obtained is displayed in the play list.

  In step 2, when the reproduction operation of the digital content 10 is performed based on the playlist through the operation unit 123, the reproduction information included in the header unit 12 of the digital content 10 on the recording medium 110 is read out to the main storage unit 126. Then, the decryption key c1 is read from the auxiliary storage unit 125, and the reproduction information is decrypted using the decryption key c1. Then, using the reproduction information, the data body 11 on the recording medium 100 is sequentially read out to the main storage unit 126 for each decryption bit length, and the decryption key c2 is read out from the auxiliary storage unit 125 to the main storage unit 126. The data on the unit 126 is sequentially decrypted using the decryption key c2 for each decryption bit length, and the data is sequentially restored from the compressed state to the original state through a filter such as MPEG. Play back (s10).

  Along with the processing of step 10, the start position information of the data body 11 is read from the recording medium 110 onto the main storage unit 126, while the position information is read from the auxiliary storage unit 125 onto the main storage unit 126, and the start position information is read from the start position information. Counting of data length and time up to position information is started (s11). Thereafter, it is determined whether or not the counting is finished (s12). Thereby, the missing portion of the data body 11 is recognized. As a result of this determination, when it is determined that the counting is completed and the missing portion of the data body 11 is recognized, if the bit length of the missing data 11a is smaller than the decoded bit length, the data body 11 is transferred from the recording medium 110, The missing data 11a is read from the auxiliary storage unit 125 onto the main storage unit 126 (that is, the data body 11 on the recording medium 110 and the missing data on the auxiliary storage unit 125 are transferred as decoded bit length data). Combine (s13). Then, the decrypted bit length data on the main storage unit 126 is decrypted using the decryption key c2 (s14), and the data is passed through a filter such as MPEG and restored from the compressed state to the original state (s15). Thereby, the data body 11 is reproduced (s16).

  When the bit length of the missing data 11a is larger than the decoding bit length, the data body 11 is read from the recording medium 110 and a part of the missing data 11a is read from the auxiliary storage unit 125 onto the main storage unit 126 (ie, The data body 11 on the recording medium 110 and a part of the missing data 11a on the auxiliary storage unit 125 are combined (transferred as decoded bit length data), and then the remaining missing data 11a from the auxiliary storage unit 125 is combined. (Decoding bit length data) is read onto the main memory 126 (s13). Then, the data on the main storage unit 126 is decrypted for each decryption bit length using the decryption key c2 (s14), and the data is passed through a filter such as MPEG to restore the compressed state to the original state (s15). Thereby, the data body 11 is reproduced (s16).

  Alternatively, a part of the missing data 11a (data corresponding to the decoded bit length) is read from the auxiliary storage unit 125 onto the main storage unit 126, and then the data body 11 is read from the recording medium 110 and the remaining data is stored from the auxiliary storage unit 125. The missing data 11a is read onto the main storage unit 126 and combined (s13). Then, the data on the main storage unit 126 is decrypted for each decryption bit length using the decryption key c2 (s14), and the data is passed through a filter such as MPEG to restore the compressed state to the original state (s15). Thereby, the data body 11 is reproduced (s16). In this way, after reproducing the data body 11 before and after the missing part, the data body 11 on the recording medium 110 is read again to the main storage unit 126 and sequentially decrypted using the decryption key c2 for each decryption bit length, and the data Are sequentially restored from the compressed state to the original state through a filter such as MPEG, and the subsequent data body 11 is reproduced (s17). If the bit length of the missing data is twice or more than the decoded bit, the process of step 13 is continuously performed. The reproduction program 20 ends when the end process is performed by the user.

  Further, a missing data deletion program (not shown) is added to the reproduction program 20. When the missing data 11a is recorded in the auxiliary storage unit 125, the playback device 120 processes the missing data deletion program, whereby the missing data 11a is transmitted indicating the difference between the date and time when the missing data 11a was received and the current date and time. When the rental period included in the rental information has reached the rental period, the missing data 11a and position information on the auxiliary storage unit 125 are deleted and the predetermined flag is defeated. It is like that.

  The management center 130 processes the data totaling interruption program shown in FIG. 6 for every predetermined period, reads the content ID, business operator information, and rental information on the data accumulation DB 136, and totals the business information for each business operator information (41). Then, the aggregated data is output to the outside (42). Thereby, the processing of the data totaling interruption program is completed.

  In the case of the digital content unauthorized use prevention method realized by the digital content unauthorized use prevention system 100, the digital content 10 is compressed and encrypted, and a part of the bit length different from the decrypted bit length is lost. And recorded on the recording medium 110 in a state of being processed so that the gap between the missing portions is continuous. When the digital content 10 is processed in this way, the data sequence of the data after the missing portion of the digital content 10 is changed to a data sequence different from the data sequence when encrypted (that is, the data sequence before being deleted). Therefore, if the data is sequentially decrypted for each decoding bit length without performing acquisition of the missing data 11a (predetermined calculation is performed), the data after the missing part is returned to the data string before encryption. First, it is converted to an unknown number sequence or alphanumeric sequence. When this unknown number sequence or alphanumeric sequence is passed through a filter such as MPEG, the reproduction of the data body 11 is stopped. For this reason, it is not possible to reproduce the data after the missing portion, thereby preventing unauthorized use of the digital content 10. Moreover, although the digital content 10 has been processed as described above, it is not copy-protected and can be copied. In order to view the copied digital content, it is necessary to obtain the missing data 11a. Therefore, while promoting the distribution of the digital content 10, the illegal use of the digital content 10 is prevented, Charges for tertiary use can be collected. Furthermore, the management center 130 aggregates the business operator information recorded in the data integration DB 136 every predetermined time, and outputs the aggregated data to the outside. Therefore, cashback, marketing, and the like can be performed on the business operator who distributed the recording medium 110 based on the aggregated data. By providing cash back to the business in this way, the price of the recording medium 110 can be reduced, and the distribution volume of the recording medium 110 on which the digital content 10 that is popular by marketing is recorded is increased. You can do it. For this reason, it becomes possible to promote the distribution of the digital content 10.

  Regarding the method of preventing unauthorized use of digital content, a playback device that decrypts and plays back the encrypted digital content for each decryption bit length, and can communicate with the playback device via a communication line and In a system comprising a management means for managing the use of digital content, the digital content is encrypted, a part of the bit length different from the decryption bit length is lost, and the gap between the missing parts is continuously packed. In addition, the business information for identifying the business that distributes the digital content is added to the digital content, and the management means includes the missing data of the digital content and which part of the digital content the missing data is. A database for missing data in which location information indicating the location is recorded in advance and distribution of digital content A data collection database for recording business operator information for promotion, and the playback device requests missing data from the management means in response to a user's application for playback of digital content. The management information added to the digital content is transmitted, and the management means reads the missing data and the position information from the missing data database in response to the request and transmits the data to the playback device. Recorded in a data accumulation database, the playback device records the missing data and location information in a memory unit, and recognizes the missing part of the digital content by referring to the location information on the memory unit when playing back the digital content. Then, the missing data read from the memory unit is combined with the missing part, and the data is decrypted. And decodes each preparative length may be carried out what design changes so long as the play.

  In the digital content 10, the data body 11 is compressed before encryption, but whether or not to compress is arbitrary. When the data body 11 is not compressed, if the data body 11 is illegally reproduced, the data body 11 is reproduced as an unknown sequence of numbers or alphanumeric sequences after the missing portion of the data body 11. Further, not only the data body 11 but also other data can be deleted. For example, the reproduction information of the header portion 12 of the digital content 10 or the like.

  Although the digital content 10 is recorded on the recording medium 110, the present invention is not limited to this. For example, the digital content 10 may be recorded in advance in the database of the management center 130 and downloaded to the playback device 120. In this case, it is desirable to record the provider information in the header part 12 of the digital content 10. Of course, the digital content 10 can be added to portions other than the header portion 12. Note that the provider information and the digital content 10 do not have to be integrated.

  The position information is the data length and time from the start position information to the missing part, but may be an address value or the like indicating the missing part. In this case, for example, it is sequentially determined whether or not the address value of the data body 11 on the recording medium 110 to be read next matches the position information. The data body 11 on the recording medium 110 shown is read, and when it is determined that they match, the missing data 11a on the auxiliary storage unit 125 is read.

  Further, it is possible to determine a missing part in advance and include the position information in the reproduction program 20. In this case, it is not necessary to record the positional information together with the missing data 11a in the missing data DB 131 of the management center 130.

  The reproduction program 20 is an example, and any program may be used as long as the same function can be realized. Further, a player ID or the like may be added to the reproduction program 20 and the player ID may be used for authentication of the management center 130. Note that the reproduction program 20 can be recorded on a recording medium and distributed.

  Although the management center 130 performs authentication and billing, the billing center 140 may perform authentication and may permit the management center 130 to transmit the missing data 11a according to the authentication result. Similarly, although the management center 130 performs user registration, it is naturally possible that the charging center 140 performs user registration and transfers this user information to the management center 130. Further, the billing center 140 and the management center 130 can be combined and operated by one server. Further, the management center 130 has the missing data DB 131, the user information DB 132, the data accumulation DB 136, and the player DB 137, but a DB installed or installed outside these management centers 130 may be used. . In this case, it communicates with the DB outside the management center 130 via the communication line α.

  It is sufficient that at least the operator information is recorded in the data collection DB 136 of the management center 130. Of course, data other than the content ID and rental information can also be recorded.

  Although the playback device 120 is a computer, any playback device 120 may be used as long as the same function can be realized.

  It goes without saying that the IP address used when the playback device 120, the management center 130, and the charging center 140 access each other can be replaced with a URL or a similar one.

  In the above embodiment, the method for renting the digital content 10 has been described. However, the design can be changed to a system that prevents unauthorized use of the digital content 10 distributed for a fee or free of charge. There are the same advantages as above. In this case, the missing data deletion program added to the reproduction program 20 may be deleted. Although the recording medium 110 is a DVD, it is not limited to this.

1 is a configuration diagram of a digital content fraud prevention system for realizing a digital content fraud prevention method according to an embodiment of the present invention; FIG. It is a flowchart of the reproduction | regeneration program processed by the control part of the reproducing | regenerating apparatus of the same system. FIG. 2 is a configuration diagram of digital content used in the system, in which (a) shows a configuration of a data body of the digital content, and (b) shows a processing process of the data body. It is a flowchart of an authentication and accounting interrupt program processed by the control unit of the management center of the system. It is a flowchart of the interruption program for user registration processed by the control part of the management center of the same system. It is a flowchart of the data totaling interruption program processed by the control part of the management center of the same system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Digital content 11 Data main body 12 Header part 20 Playback program 100 Digital content illegal use prevention system 110 Recording medium 120 Playback apparatus 130 Management center 140 Billing center

Claims (7)

Encrypted digital content includes at least one part of the data string, a data body that is missing by a bit length different from the decryption bit length, and missing data that is data at the missing part of the digital content Separated from the data,
The data body is recorded on a recording medium in a state where a data string after the missing portion is shifted and continuous, and business information for identifying a business that distributes digital contents is added. Assuming
A first recording unit and a second recording unit, wherein the data body on the recording medium is transferred to a second storage unit for each decoding bit length, and the data on the second storage unit is transferred A playback device that decrypts and plays back the main body;
  A database for missing data, which is connected to the playback device via a communication line and in which position information indicating the missing data and which part of the data string of the data body is recorded in advance, and a digital Management means having a data collection database for recording business information in order to promote the distribution of content,
  Upon receiving the missing data request and the provider information from the playback device, the management means reads the missing data and its position information from the missing data database in response to the request and transmits them to the playback device. It is to be recorded in the data collection database,
  In response to the user's application for reproduction operation of the data body, the playback device requests the management unit via the communication line for the missing data and the position information related to the data body, and adds the data to the data body on the recording medium. Read out the carrier information transmitted to the management means via the communication line, and in response to this, the missing data and the position information transmitted from the management means are received and recorded in the first storage unit,
  Thereafter, in reproducing the data body, the position information on the first storage unit is transferred to the second storage unit, the missing part of the data string of the data body is recognized by referring to the position information, and recorded. The data body on the medium is transferred to the second storage unit, while the missing data on the first storage unit is transferred to the second storage unit, and the data string of the data body is transferred to the second storage unit. An unauthorized use prevention system for digital contents, wherein the missing data is combined with the missing portion and the combined data is decrypted. The system for preventing unauthorized use of digital content according to claim 1,
Said management means, illegal use preventing system of a digital contents, characterized in that it is as to aggregate business information recorded on the data integration database. The system for preventing unauthorized use of digital content according to claim 1,
A system for preventing unauthorized use of digital contents, wherein the provider information is stamped on a recording medium. The digital content fraud prevention system according to claim 1, 2 or 3, wherein the digital content is compressed before being encrypted.
When reproducing the data body , the reproducing device transfers the position information on the first storage unit to the second storage unit, and recognizes the missing part of the data string of the data body by referring to the position information. The data body on the recording medium is transferred to the second storage unit, while the missing data on the first storage unit is transferred to the second storage unit, and the data body on the second storage unit is transferred to the second storage unit. An unauthorized use prevention system for digital contents , wherein the missing data is combined with the missing portion of the data string, the combined data is decrypted, and restored from the compressed state to the original state . In the system for preventing unauthorized use of digital content according to claim 1, 2, 3 or 4,
An unauthorized use prevention system for digital content, wherein the bit length of missing data is a bit length different from a divisor of the decryption bit length. The digital content unauthorized use prevention system according to claim 1, 2, 3 , 4, or 5 , wherein a part of the digital content data string is missing at a plurality of locations.
The system for preventing unauthorized use of digital content, wherein the bit length of missing data × the number of missing portions is a bit length different from a divisor of the decoding bit length. The system for preventing unauthorized use of digital content according to claim 1 ,
The system for preventing unauthorized use of digital content, wherein the data body is not input to a recording medium but is input to and recorded in a first storage unit of a playback apparatus.

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