JP2005129230A - Information recording medium, and method and program for judging original/counterfeit of information recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information recording medium which can prevent an illegal copy. <P>SOLUTION: When sector addresses and sector data are recorded in a user data area 1c extending to a plurality of sectors by the unit of a sector and a plurality of sectors are imparted duplicated partially in a state where the sector addresses tend to increase in order, the (N+1)th duplicated sector address site which appear after duplicated sector address site which have appeared at N-th (N is a natural number) is arranged between a final sector address (n) whose address value is large among the N-th duplicated sector address sites and a sector address n+1 larger than the sector address (n) by one, and two or more of the sector addresses in the N-th duplicated sector address sites are imparted by consecutive numbers. In addition, sector data corresponding to the (N+1)th duplicated sector address sites is recorded differently to the N-th duplicated sector address sites. The information recording medium 1 has such characters. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an information recording medium capable of preventing illegal copying, an information recording medium authenticity determination method, and an information recording medium authenticity determination program.

  As an information recording medium for distributing computer software, a read-only CD-ROM (Compact Disc-Read Only Memory) suitable for mass production and inexpensive is widely used. This kind of read-only CD-ROM, like a well-known read-only CD (Compact Disc) containing music information, has an outer diameter of 120 mm and a center hole using a transparent resin material by an injection molding machine or the like. When a disk-shaped transparent disk substrate having a hole diameter of 15 mm and a substrate thickness of 1.2 mm is formed, the information signal to be recorded is converted into an uneven pit string on the transparent disk substrate, and this pit string is A signal surface is formed by carving as a spiral recording track, and a reflection film and a protective film are sequentially formed on the signal surface.

  When a conventional CD-ROM is reproduced using a CD-ROM drive mounted in a personal computer, a reproduction laser beam from an optical pickup provided movably in the drive is transmitted from the transparent disk substrate side to the signal surface. The signal surface is reproduced by the return light of the laser beam from the reflection film that is irradiated on the signal surface and deposited on the signal surface.

FIG. 1 is a diagram schematically showing a sector structure when Mode 1 which is a typical format is applied to a read-only CD-ROM.
FIG. 2 is a diagram for explaining the sector arrangement of information signals recorded on a conventional CD-ROM. (A) shows the order of reading each sector along the sector arrangement, and (b) shows the sector of each sector. A diagram showing addresses and sector data correspondingly,
FIG. 3 is a block diagram for explaining a general CD-ROM drive.

  Here, in general, the information signal recorded on the read-only CD-ROM is recorded on the signal surface on the disk substrate over a plurality of sectors in units of sectors, as shown in FIG. For example, when Mode 1 which is a typical format is applied, one sector is recorded with a data capacity of 2,352B.

  More specifically, as shown in FIG. 1, one sector is composed of four areas in the order of SYNC, HEADER, DATA, and EDC / ECC from the top.

  The SYNC area (12B) described above is an area indicating the head of a sector, and a specific data string is recorded therein.

  The HEADER area is composed of an ADDRESS area (3B) and a MODE area (1B). At this time, the former ADDRESS area is an area for recording a sector address which is simply increased with the start point of the recording area on the inner periphery of the disk substrate as a base point, and its display method uses three values (Min ... min: Sec ...). Second: Block ... Block number). On the other hand, the latter MODE area is recorded as a CD-ROM format classification, for example, “01” in the case of mode 1 and “02” in the case of mode 2.

  The DATA area (2,048B) is an area for recording information signals (software) such as video signals for users, audio signals, and computer data signals.

  The EDC (Error Detection Code) / ECC (Error Correction Code) area (288B) is an area for recording error detection of recording data completed in units of sectors and recording error correction codes.

  Furthermore, in the conventional CD-ROM, when a plurality of sectors having the above-described structure are recorded along a spiral recording track on the disk substrate, the sector address is assigned to the disk substrate as shown in FIG. Is recorded so as to increase simply toward the outer periphery with reference to the data start point of the inner periphery, for example, sector addresses n-5, n-4, n-3,... n, n + 1, n + 2,..., n1 + 5.

  Accordingly, sector data is recorded in each sector. As shown in FIG. 2B, for example, sector addresses n-5, n-4, n-3,..., N, Corresponding to n + 1, n + 2,..., n1 + 5, sector data is recorded with the contents of W-5, W-4, W-3,..., W, W + 1, W + 2,. Yes.

  Here, a general CD-ROM drive installed in a personal computer will be briefly described with reference to FIG.

  The general CD-ROM drive 10 shown in FIG. 3 is controlled by the controller 11 as a whole. A turntable 14 is fixed to the shaft of a spindle motor 13 that is rotationally driven by the spindle motor drive circuit 12, and a CD-ROM is rotatably mounted integrally with the turntable 14 on the turntable 14.

  Further, an optical pickup 15 is provided on the lower surface side of the CD-ROM so as to be movable in the radial direction of the CD-ROM while being mounted on the pickup support base 16.

  The optical pickup 15 described above uses a semiconductor laser 15a that emits laser light, and a laser beam that is narrowed down after the laser light emitted from the semiconductor laser 15a passes through a collimator lens, a beam splitter, etc. (not shown) on the signal surface of the CD-ROM. An objective lens 15b to be irradiated, a focus coil 15c for focus control of the objective lens 15b, a tracking coil 15d for tracking control of the objective lens 15b, and a return light of the laser beam reflected by the signal surface of the CD-ROM 4 A split type photo sensor 15e is provided inside.

  Then, the return light detected by the four-divided photosensor 15e in the optical pickup 15 is input to the information signal processing circuit 17, and in this information signal processing circuit 17, a focus error signal, tracking error signal, sector address signal, sector Data signals are detected and sent to the controller 11.

  Further, when the controller 11 starts the reproduction operation in response to a command from the personal computer, the focus control signal generated by the focus servo circuit 18 based on the focus error signal is applied to the focus coil 15c in the optical pickup 15 to focus the objective lens 15b. The optical pickup 15 on the pickup support 16 is coarsely moved so as to approach the target sector address position by the optical pickup coarse movement circuit 20 while being controlled. When the optical pickup 15 comes close to the target sector address position, the tracking servo is performed based on the tracking error signal. The tracking control signal generated by the circuit 19 is applied to the tracking coil 15d in the optical pickup 15 to perform tracking control of the objective lens 15b at the target sector address. Further, the controller 11 outputs a sector data signal to an external device such as a personal computer or a CD-R drive via the interface circuit 21.

  When a conventional CD-ROM is reproduced in the above-described general CD-ROM drive 10, the MMC command (multimedia command) “READ (10)” and “Read CD” are transmitted from the personal computer. doing. Here, normally, the optical pickup 15 provided movably in the CD-ROM drive 10 searches for a sector address about 5 to 10 sectors before the target sector address on the inner circumference side of the disk, and from there Until the sector data of the target sector address comes out, the data is continuously read to obtain the target sector data.

  That is, when reading the sector data of each sector recorded on the CD-ROM, the optical pickup 15 is moved to the inner circumference side of the disk substrate, and the inner circumference of the disk is read according to the data reading sequence (1) shown in FIG. Generally, a method of reading in a direction (arrow direction) in which the sector address sequentially increases from the smaller sector address toward the outer periphery of the disk.

  However, these days, the external appearance is almost the same as this CD-ROM, and the user can record the information signal only once with the same CD recording format as the information signal (software) recorded on the CD-ROM. A type of CD-R (Compact Disc-Recordable) is available at low cost.

  The above-described write-once CD-R is used for forming a disk-shaped transparent disk substrate having an outer diameter of 120 mm, a center hole diameter of 15 mm, and a substrate thickness of 1.2 mm by using a transparent resin material by an injection molding machine or the like. In addition, a concave groove is spirally formed on a transparent disk substrate, an organic dye serving as a recording layer is spin-coated on the concave groove side, and a reflective film and a protective film are sequentially formed on the organic dye. It is formed as a film.

  This write-once type CD-R uses a recordable / reproducible optical disc drive (hereinafter referred to as a CD-R drive) to transmit a recording laser beam from an optical pickup movably provided in the drive to a transparent disc. An information signal can be recorded by irradiating the recording layer from the substrate side. Further, after writing the information signal, it can be handled by the CD-ROM drive 10 in the same manner as the CD-ROM.

  In this case, the user reproduces the CD-ROM containing the software to be copied in accordance with the copy software stored in the hard disk in the personal computer, is output from the CD-ROM drive 10 and is output from the CD-ROM drive 10 and the CD-R. It is possible to input information (record information) to be recorded on the CD-R drive and illegally copy the recorded information to the CD-R without obtaining the permission of the copyright holder.

  At this time, the copy software stored in the hard disk in the personal computer generally includes a sector copy method for reading information signals recorded on the CD-ROM in the order of sector addresses, and information signals recorded on the CD-ROM in file units. There are two types of file copy methods to be read. For example, when using copy software to which the former sector copy method is applied, as described above, information to be recorded output from the CD-ROM drive 10 ( Since the recording information is output in the order of sector addresses, the CD-R can be recorded in the same state as the recording state of the CD-ROM, so that illegal copying is possible. Damage caused by illegal copying on CD-Rs is frequent.

  In addition, when using the copy software to which the latter file copy method is applied, it is impossible to completely prevent illegal copy even by the second method of illegal copy prevention technology as described later. The detailed description of is omitted.

  At this time, although the recording prohibition flag is defined in the CD-ROM recording format with the subcode Q channel data, illegal copying of software is currently performed by ignoring the copy prohibition flag. .

  Therefore, as the above-described illegal copy prevention technology for CD-ROM, there are [First Method] to [Third Method] described below.

[First method]
The first method is an illegal copy prevention method employed for so-called game disks. The game CD-ROM takes advantage of the characteristic that it can only be played on a dedicated game machine, and in the process of producing a disc master for the game CD-ROM, a special security signal that is not recorded on a normal CD-ROM is used. Is recorded on the recording signal. If the special security signal can be detected from the game CD-ROM, the dedicated game machine determines that the disc is a genuine game CD-ROM and starts reading the game CD-ROM.

  According to the first method, information to be recorded (recorded information) obtained by reproducing game CD-ROM software on a dedicated game machine is input to a commonly used CD-R drive, Even if the game CD-ROM software is copied to the CD-R, this CD-R drive does not have a function to detect and record special security signals, so the game CD-ROM is illegally copied to the CD-R. Even so, no special security signal is recorded on this CD-R, and it cannot be reproduced as a game disc.

[Second method]
The second method is an illegal copy prevention method employed in a computer software CD-ROM. This is effective when the computer software recorded on the computer software CD-ROM is illegally copied to the CD-R in file units.

  Specifically, in order to prevent the file read from the CD-ROM for computer software from being temporarily recorded in a predetermined file format on the hard disk in the personal computer and then recorded on the CD-R. A special sector that cannot be detected by a normal file search is inserted between two arbitrary files among a plurality of user recorded files recorded on a CD-ROM for computer software. The presence / absence of this special sector is used to determine the authenticity of the computer software CD-ROM.

  In other words, the second method is made by paying attention to the fact that the physical structure of the computer software CD-ROM cannot be copied. In other words, the CD-ROM for computer software is originally composed of two layers: a level managed by a physical sector that defines the physical structure of the disk and a logical structure level that defines the file structure on the physical sector. Yes. When the data read from the two-layer computer software CD-ROM is recorded on the hard disk in units of files, the data of only the logical structure of the computer software CD-ROM is inherited (recorded). The physical structure of this computer software CD-ROM is not recorded at all. That is, for example, the sector address, sector ID, and error correction information related to the physical sector structure necessary for disk recording are not copied to the hard disk side.

  Once the logical structure file recorded on the hard disk side is copied to the CD-R via the CD-R drive, the special sector is not copied to the CD-R side. The presence / absence of this special sector is used (for example, JP-A-4-119561).

[Third method]
According to the third method, one (1 byte) of user data (24 bytes) of the EFM frame constituting the CD-ROM is logically or physically destroyed, and an error signal generated during reproduction of the CD-ROM. Is used as a security signal of the disk and used for authenticity determination (for example, Japanese Patent Laid-Open No. 7-235130).

  By the way, the game CD-ROM according to the first method described above is an ideal means as an illegal copy prevention countermeasure disk. However, this method requires that the player be a dedicated game machine that detects a special security signal for copy protection recorded on a game CD-ROM, and is a general player attached to a personal computer that does not have this function. This method is not applicable to the CD-ROM drive 10.

  Further, the CD-ROM for computer software according to the second method described above is an effective means only in the method of copying in a file format to a hard disk in a personal computer and then recording from the hard disk to a CD-R. However, since it is easily broken by the sector copy method in which the physical sector structure of the computer software CD-ROM is copied to the CD-R in order from the beginning, it cannot be said to be an effective method at present.

  Further, the CD-ROM according to the third method described above is a technique in which a specific location is logically or physically destroyed, and a read error signal at that location is used as authentication information. However, the destruction method makes one byte of the EFM frame unreadable, and in the normal reading, the error is corrected to become readable data, but in the third method, a reading error signal is obtained. However, it is not disclosed what signal the read error signal becomes from the CD-ROM drive 10 when one byte of the EFM frame is specifically made unreadable.

  Taking the above-mentioned third method as an example of an actual CD-ROM, when examining illegal copy prevention, error correction C1 and C2 series of known CDs (Compact Discs) that store music information etc. in substantially the same shape as the CD-ROM Then, a maximum of 4 symbols can be corrected by the erasure method, which means that a 14.38 mm burst error of 14 frames length can be corrected. Further, in the correction of the CD-ROM C3 series with an enhanced correction function, a C2 error in which the CD CIRC (Cross Interleaved Reed-Solomon Code) becomes uncorrectable is used as a flag, and a maximum length of 26 to 28 frames can be obtained. Can correct burst errors of .42 to 4.76 mm.

  Even if such a CD-ROM having a burst error correcting function is used, even if an error of about 1 byte in the EFM frame by the third method, that is, local destruction of about 5 μm in physical length is attempted, Is error-corrected and it is difficult to obtain an error occurrence signal.

  On the other hand, each value of CD defect, error rate, and burst error length is defined by the standard. That is, the defect size should be 100 μm or less, the error rate (C1) for 10 seconds should be 3% or less, and the burst error length should be less than 1.2 mm of 7 frames. A specific method for generating a read error signal satisfying such a standard having an error correction function is not disclosed in the third method, and it is doubtful whether it can be applied to an actual CD-ROM. Also, in the third method, similarly to the second method, it is possible to make the read error sector the same sector by copying in units of sectors.

  Therefore, an information recording medium (CD-ROM) that can perform normal reproduction such as tracking with a CD-ROM and that cannot be copied by the sector copy method described above is desired.

The present invention has been made in view of the above problems, and in the invention according to claim 1, sector addresses and sector data are recorded in a user data area over a plurality of sectors in a sector unit, and the plurality In the information recording medium provided with a part of the sector address, the sector address is gradually increasing,
The N + 1th overlapping sector address portion appearing after the overlapping sector address portion appearing at the Nth time (where N is a natural number) is the final sector address n having the largest address value among the Nth overlapping sector address portions. And the sector address n + 1 that is one greater than the sector address n, and at least two or more of the sector addresses in the Nth overlapping sector address portion are assigned in sequence, The information recording medium is characterized in that the sector data corresponding to the N + 1th overlapping sector address portion is recorded differently with respect to the Nth overlapping sector address portion.

According to a second aspect of the present invention, sector addresses and sector data are recorded in the user data area over a plurality of sectors in units of sectors, and the sector addresses of the plurality of sectors tend to increase sequentially. In the information recording medium given in part in
The N + 1th overlapping sector address portion appearing after the overlapping sector address portion appearing at the Nth time (where N is a natural number) is the final sector address n having the largest address value among the Nth overlapping sector address portions. And the sector address n + 1 that is one greater than the sector address n, and at least two or more of the sector addresses in the Nth overlapping sector address portion are assigned in sequence, The sector data corresponding to the N + 1th overlapping sector address portion is recorded differently with respect to the Nth overlapping sector address portion, and error correction is performed in the sector data corresponding to the N + 1th overlapping sector address portion. An information recording medium characterized by including impossible data.

According to a third aspect of the present invention, sector addresses and sector data are recorded in a user data area over a plurality of sectors in a sector unit, and the sector addresses of the plurality of sectors tend to increase sequentially. N + 1 overlapping sector address portions appearing after the overlapping sector address portion appearing at the Nth time (where N is a natural number) are the Nth overlapping sector address portion. Are located between the last sector address n having a larger address value and the sector address n + 1 which is one greater than the sector address n, and the sector address in the Nth overlapping sector address portion is at least Two or more sequential numbers are assigned, and the sector data corresponding to the N + 1th overlapping sector address part is the N An information recording medium recorded differently for duplicate sector address portion of the eye,
Determining authenticity based on whether or not at least one set of sector data corresponding to the same sector address is different between the Nth overlapping sector address part and the N + 1th overlapping sector address part. The information recording medium is characterized in that an authenticity determination program is recorded in an area different from the user data area.

According to a fourth aspect of the present invention, sector addresses and sector data are recorded in a user data area over a plurality of sectors in units of sectors, and the sector addresses of the plurality of sectors tend to increase sequentially. N + 1 overlapping sector address portions appearing after the overlapping sector address portion appearing at the Nth time (where N is a natural number) are the Nth overlapping sector address portion. Are located between the last sector address n having a larger address value and the sector address n + 1 which is one greater than the sector address n, and the sector address in the Nth overlapping sector address portion is at least Two or more sequential numbers are assigned, and the sector data corresponding to the N + 1th overlapping sector address part is the N A authenticity determination method of determining the information recording medium authenticity eye duplicate sector address different recorded information recording medium relative to the site,
The authenticity is determined based on whether at least one set of sector data corresponding to the same sector address is different between the Nth overlapping sector address part and the N + 1th overlapping sector address part. This is a characteristic information recording medium authentication method.

Furthermore, in the invention described in claim 5, sector addresses and sector data are recorded in the user data area over a plurality of sectors in units of sectors, and the sector addresses of the plurality of sectors tend to increase sequentially. N + 1 overlapping sector address portions appearing after the overlapping sector address portion appearing at the Nth time (where N is a natural number) are the Nth overlapping sector address portion. Are located between the last sector address n having a larger address value and the sector address n + 1 which is one greater than the sector address n, and the sector address in the Nth overlapping sector address portion is at least Two or more sequential numbers are assigned, and the sector data corresponding to the N + 1th overlapping sector address part is the N A authenticity determination program determines the information recording medium authenticity eye duplicate sector address different recorded information recording medium relative to the site,
Determining authenticity based on whether or not at least one set of sector data corresponding to the same sector address is different between the Nth overlapping sector address part and the N + 1th overlapping sector address part. An information recording medium authentication program characterized by being stored.

  According to the information recording medium of claim 1, sector addresses and sector data are recorded in the user data area over a plurality of sectors in a sector unit, and the sector addresses of the plurality of sectors tend to increase sequentially. The N + 1th overlapping sector address portion that appears after the overlapping sector address portion that appears at the Nth time (where N is a natural number) is the Nth overlapping sector address portion. Is placed between the last sector address n having a larger address value and the sector address n + 1 which is one greater than the sector address n. In the case of illegal copying without permission, a normal drive device operates without any trouble, but N + on illegally copied information recording media Since the sector data corresponding to the duplicate sector address part of the second time cannot be copied and is lost, this causes discontinuous sector data to be lost when an illegally copied information recording medium is reproduced on the drive device. Since it cannot be used and illegal copying is wasted, illegal copying to an information recording medium can be completely prevented, and copyright infringement can be prevented beforehand.

  According to the information recording medium of claim 2, sector addresses and sector data are recorded in the user data area over a plurality of sectors in a sector unit, and the sector addresses of the plurality of sectors tend to increase sequentially. The N + 1th overlapping sector address portion that appears after the overlapping sector address portion that appears at the Nth time (where N is a natural number) is the Nth overlapping sector address portion. Are located between the last sector address n having a larger address value and the sector address n + 1 that is one greater than the sector address n, and at least two sector addresses in the Nth overlapping sector address portion. The sector data corresponding to the (N + 1) th overlapping sector address portion is given as the Nth overlapping sector address. Since the error correction impossible data is included in the sector data corresponding to the N + 1th overlapping sector address portion, the same effect as in the above-mentioned claim 1 is obtained. In addition, even if a drive device that does not check the sector address value and outputs only the number of sectors specified from the start sector address is used, the sector data corresponding to the N + 1th duplicate sector address portion is read. Can be prevented.

  According to the information recording medium of claim 3, the information recording medium authentication method of claim 4, and the information recording medium authentication program of claim 5, the sector address and sector data are sector-by-sector. It is recorded in the user data area over a plurality of sectors, and the plurality of sectors are given some overlap while the sector address tends to increase sequentially, Nth (where N is a natural number) The N + 1th overlapping sector address portion that appears following the appearing overlapping sector address portion is the last sector address n having a larger address value among the Nth overlapping sector address portions, and one larger than this sector address n. It is placed between sector address n + 1 and at least two sector addresses in the Nth overlapping sector address part are assigned consecutively. Furthermore, when the sector data corresponding to the N + 1th overlapping sector address portion is recorded differently with respect to the Nth overlapping sector address portion, the Nth overlapping sector address portion and the N + 1th overlapping sector address portion are recorded. Since authenticity is determined based on whether or not a set of sector data corresponding to at least one set of the same sector address is different from each other, genuine information is obtained when a set of sector data is different from each other. It can be determined that it is a recording medium, and on the other hand, it can be determined that it is a copied information recording medium when a set of sector data is the same.

  Embodiments of an information recording medium, an information recording medium authenticity determination method, and an information recording medium authenticity determination program according to the present invention will be described below with reference to FIGS. 4 to 13. <Embodiment 1>, <Embodiment 2> , <Application Examples of Embodiments 1 and 2> will be described in detail in this order.

  The information recording medium according to the present invention is applied to a read-only CD-ROM (Compact Disc-Read Only Memory), and the information signal (software) is a sector unit adopted in the CD-ROM. The information signal (software) recorded on the CD-ROM is recorded on the signal surface of the disk substrate over a plurality of sectors and a part of the sector address of the plurality of sectors is given in an overlapping manner. Can be copied to a CD-R (Compact Disc-Recordable) that can be written only once, or a CD-RW (Compact Disc-ReWriteable) that can be written a plurality of times.

  In addition, an information recording medium authenticity determination method according to the present invention and an information recording medium authenticity determination program according to the present invention include a set of sectors corresponding to a set of sector addresses in a part of which sector addresses overlap. Whether the information recording medium (CD-ROM) according to the present invention described above or a copy of the information recording medium (CD-ROM) according to the present invention is determined based on whether the data is different from each other. Is.

  The sector reading method applied to the information recording medium according to the present invention and the sector reading program applied to the information recording medium according to the present invention use the above-described information recording medium (CD-ROM) according to the present invention. When reproducing multiple sectors, it is possible to reliably read the overlapping sector address (overlapping sector address) in a new reading step without continuously reading the overlapping part of the sector address. It is what.

FIG. 4 is a diagram showing the overall configuration of the information recording medium (CD-ROM) of Example 1 according to the present invention,
5A and 5B are diagrams for explaining the sector arrangement of information signals recorded on the information recording medium (CD-ROM) of Embodiment 1 according to the present invention. FIG. 5A shows the order of sector arrangement, and FIG. It is the figure which showed the sector address and sector data of each sector correspondingly.

  As shown in FIG. 4, the information recording medium (hereinafter referred to as CD-ROM) 1 according to the first embodiment of the present invention has a lead-in area 1a from the inner periphery to the outer periphery of the disk substrate formed in a disk shape. An ISO file system area 1b, an application software area 1c, a user data area 1d, and a lead-out area 1e are sequentially formed along a spiral recording track.

  In the lead-in area 1a, the table of contents and contents of software recorded in the user data area 1d, the storage time, and the like are recorded. Further, a file structure compliant with ISO (International Organization for Standardization) is recorded in the ISO file system area 1b. The application software area 1c stores at least an authentication program and a sector reading program, which are a part of the main part of the present invention, which will be described later. In addition, in the user data area 1d, in order to record information signals (software) such as video signals for users, audio signals, computer data signals, etc., a plurality of sectors has at least a sector address and a sector for each sector unit. The sector structure here is the same as the structure described above with reference to FIG. 1, but the sector address and sector data of each sector is different from that of a conventional CD-ROM. This is partly different and will be described later. In the lead-out area 1e, a signal indicating that the recorded software is final is recorded.

  Here, although the information signal (software) recorded in the user data area 1d of the CD-ROM 1 of the first embodiment has a plurality of sectors recorded as described above, the plurality of sectors are shown in FIG. As shown in (a), sector addresses overlap in some parts, and the sector data corresponding to the overlapping sector addresses are different from each other as shown in FIG. 5 (b). There is a feature.

  More specifically, as shown in FIG. 5A, a plurality of sectors are on a spiral recording track from the inner periphery of the disk to the outer periphery, and the sector address n-5, n-4, n-3, n-2, n-1, and n are assigned, and a sector address that partially overlaps the sector address assigned to the area X part in the area Y part following the area X part n-4 , N−3, n−2, n−1, and n, and sector addresses n + 1, n + 2, n + 3, n + 4, and n + 5 are allocated to the area Z portion that follows the area Y portion. Here, two overlapping sector address portions having the same sector address value are provided in the area X and area Y on the inner periphery side of the disk. However, the same sector address value is assigned without being limited thereto. If at least two overlapping sector address parts are provided close to each other, illegal copying is more difficult.

  In addition, when overlapping sector address parts are provided not only on the inner circumference side of the disk but also on the inner circumference side of the disk or on the outer circumference side of the disk, the plural sector address parts are provided with a plurality of spaced intervals. By assigning a sector address value different from the overlapping sector address part on the inner circumference side of the disk, illegal copying becomes more difficult.

  Here, the sector addresses n-4 to n assigned to the area X portion are the overlapping sector address portions that appear at the Nth time (where N is a natural number), and the sector addresses n-4 assigned to the area Y portion Assuming that the overlapping sector address portion appearing up to N + 1 is up to n, when the area X part and the area Y part are set on the inner circumference side of the disk from the above description, for example, N = 1 first overlapping sector address in the area X part A part appears, and for example, the N = 2th overlapping sector address part appears in the area Y.

  At this time, at least two or more overlapping sector address parts appearing in the N + 1th time with respect to the overlapping sector address part appearing in the Nth time are assigned consecutive numbers, and the N + 1th overlapping sector address part and the N + 1th time overlapping If the sector address portion is provided within a range close to each other on the recording track, the overlapping sector address portion can be easily read at the time of sector reading described later.

  Along with the above, each sector data is recorded in each sector, and as shown in FIG. 5B, for example, sector addresses n-5, n-4, n-3, ..., sector data corresponding to X, X-4, X-4, X-3, ..., X is recorded, and sector address n-4, n-3 of area Y ,..., N corresponding to the sector data is recorded with the contents of Y-4, Y-3,..., Y, and the sector addresses n + 1, n + 2,. Correspondingly, sector data is recorded with the contents of Z + 1, Z + 2,..., Z + 5. At this time, it is a necessary condition for preventing illegal copying that each sector data corresponding to each overlapping sector address has different contents.

  Next, the operation of the user intentionally illegally copying the information signal (software) recorded on the CD-ROM 1 to the CD-R will be described earlier with reference to FIG. 3 described in the prior art and in this embodiment. This will be described with reference to FIG. 4 described above and new FIGS. 6 and 7.

6A and 6B are diagrams for explaining the operation when the information recording medium (CD-ROM) of Example 1 according to the present invention is illegally copied. FIG. 6A shows a sector read operation, and FIG. A diagram showing the sector address and sector data corresponding to each sector when reading,
FIG. 7 is a diagram for explaining the sector arrangement on the CD-R after illegally copying the information recording medium (CD-ROM) of the first embodiment according to the present invention. (B) is a diagram showing the sector address and sector data of each sector in correspondence with each other.

  First, in order to copy the above-described CD-ROM 1 to the CD-R, the user inserts the CD-ROM 1 with the CD-ROM drive 10 according to the copy software stored in the hard disk in the personal computer as described in the prior art. Information to be recorded (recorded information) obtained by reproduction and input here is input to the CD-R drive, and the recorded information is illegally copied to the CD-R without obtaining the permission of the copyright holder. To do.

  Here, as described in the prior art, when using the copy software to which the sector copy method is applied, as described above, information (recording information) that is output from the CD-ROM drive 10 and is recorded on the CD-R. ) Of the lead-in area 1a, ISO file system area 1b, application software area 1c, user data area 1d, and lead-out area 1e shown in FIG. 4 from the inner circumference side to the outer circumference side of the CD-ROM 1. Although sequentially output, when a plurality of sectors recorded in the user data area 1d are read, they are read in the sector address order according to copy software to which the sector copy method is applied.

  More specifically, as shown in FIGS. 6A and 6B, the sector data is read from the CD-ROM 1 by the CD-ROM drive 10 with the optical pickup 15 as the target as described in the prior art. Starting from the inner circumference side of the disk 5 to 10 sectors before the sector address to be performed. Then, for example, from the time when the target sector address n-5 is found in the area X, each sector address n-5, n-4, n-3, n in the area X according to the data reading order (2-1). Address search is performed in the order of -2, n-1, and n, and each sector data X-5, X-4, X-3, X-2, X-1, X corresponding to each sector address is read continuously.

  Next, each sector address n−4, n−3, n−2, n−1, and n in the region Y portion following the region X portion partially overlaps with the region X portion, and is next to the sector address n. Since there is only a sector address smaller than the sector address n + 1, address search is performed to the next area Z in accordance with the data reading order (2-2). Therefore, each sector data corresponding to each sector address in the area Y is not output at all.

  Next, the area Z section has a sector address n + 1 at the head, and the CD-ROM drive 10 reads the area Z section again in the normal operation according to the data reading order (2-3) in the same manner as the area X section.

  Therefore, when the sector data from sector addresses n-5 to n + 5 are continuously read and illegally copied to the CD-R, the sector address array is the area X and area Z as shown in FIG. Since the area Y portion is not interposed between them and the sector data in the area Y portion is missing, when the illegally copied CD-R is reproduced by the CD-ROM drive 10, the data reading order (3) is followed. Since it is reproduced, the reproduced sector data cannot be used because it becomes discontinuous sector data in which the sector data in the area Y is missing as shown in FIG. 7B, and thus illegal copying is wasted. Therefore, the CD-ROM 1 of the first embodiment can completely prevent illegal copying to the CD-R and prevent copyright infringement.

  Next, the operation of properly reproducing the CD-ROM 1 of the first embodiment using a general CD-ROM drive 10 is used in combination with FIGS. 3 to 5 described above and the new FIGS. To explain.

FIG. 8 is a flowchart showing the operation of the authenticity determination program of the information recording medium (CD-ROM) according to the first embodiment of the present invention.
FIG. 9 is a flowchart showing the operation of the sector reading program of the information recording medium (CD-ROM) of Embodiment 1 according to the present invention.
FIG. 10 is a diagram for explaining the operation when the information recording medium (CD-ROM) according to the first embodiment of the present invention is normally reproduced. (A) shows the sector reading operation, and (b) shows the sector reading operation. It is the figure which showed the sector address and sector data of each sector corresponding to the sector reading.

  Here, when the CD-ROM 1 of the first embodiment is mounted on a general CD-ROM drive 10 and a reproducing operation is started in response to a command from a personal computer, the optical pickup 15 moves from the inner periphery side of the CD-ROM 1 to the lead-in area. 1a, ISO file system area 1b, application software area 1c, and user data area 1d are read in this order.

  At this time, at least the information recording medium authentication program 50 shown in FIG. 8 and the sector reading program 70 of the information recording medium shown in FIG. 9 are stored in the application software area 1c.

  In the following description, the authenticity determination program 50 of the information recording medium shown in FIG. 8 includes a duplicate sector address search operation in the sector reading program 70 of the information recording medium shown in FIG. Although authenticity is determined, the present invention is not limited to this, and a set of sector data corresponding to at least one set of the same sector address among the overlapping sector address portions on the CD-ROM 1 is included. Any program can be used as long as it can determine whether or not they are different from each other. In this embodiment, the case of the steps shown in FIG. 8 will be described.

  Further, when the overlapping sector address portions are arranged on the CD-ROM 1 at a plurality of intervals such as the inner circumference side of the disc, the middle circumference side of the disc, and the outer circumference side of the disc, N (however, in this case) (N is a natural number equal to or greater than 2) The authenticity of the disk is determined at the two overlapping sector address portions at the first and N + 1th times, and it is determined that the disc is genuine, and then the sector reading is performed by the sector reading program 70.

  In addition, the sector reading program 70 is started first to read a plurality of sectors, and thereafter, the authenticity determination program 50 determines the authenticity of the disk at the position of a predetermined overlapping sector address, which is determined to be genuine. Later, it is also possible to read a plurality of sectors in succession from the previous read final position by the sector read program 70 again.

  Further, when the authenticity determination program 50 determines that the CD-ROM 1 is genuine, the CD-ROM 1 is reproduced again without being taken out from the CD-ROM drive 10, or the genuine disc number is designated as the CD-ROM. When the data is stored in the drive 10 and taken out once and then re-mounted in the CD-ROM drive 10, only the sector reading program 70 can be read without reading the authentication program 50.

  Here, in the above-described authenticity determination program 50 and sector reading program 70, it is known in advance that a plurality of sector addresses recorded on the CD-ROM 1 are duplicated in some places. Both programs are based on information. When the authenticity determination program 50 and / or the sector reading program 70 stored in the application software area 1 c is read by the optical pickup 15, both programs 50 and 70 are transmitted to the controller 11 via the information signal processing circuit 17. Therefore, the controller 11 performs an address search with the objective lens 15b in the optical pickup 15 by the tracking servo circuit 19 after moving the optical pickup 15 to the vicinity of the target sector address by the optical pickup coarse movement circuit 20.

  At this time, as described above, when the CD-ROM 1 is copied to the CD-R using the copy software stored in the hard disk in the personal computer, the application software area 1c of the CD-ROM 1 is illegally copied to the CD-R. Even so, since each sector of the user data area 1d can only be copied in the sector address order, even if the authenticity determination program and the sector reading program in the illegally copied application software area 1c are operated, there is a duplication. It is clear from the above description that each sector address and the corresponding sector data cannot be read.

  First, when authenticating the CD-ROM 1 using the information recording medium authenticity determination program 50 shown in FIG. 8, among the sector addresses partially overlapped in the area X and area Y, for example, It is determined whether or not a set of sector data corresponding to a preset set of overlapping sector addresses n-2 and n-2 is the same. It can be determined that the corresponding sector data are different from each other.

  That is, in FIG. 5 and FIG. 8, when the operation flow of the authenticity determination program 50 is started, the sector address n-2 designated in advance in the area X part is searched by the optical pickup 15 in step S51, and the sector data X corresponding to this is searched. -2 is acquired.

  Next, in step S52, the sector data X-2 acquired in step S51 is stored in the first memory M1 provided in the controller 11 (FIG. 3).

  Next, in step S53, a search is performed from the area X to the sector address n + 5 in the area Z without reading the area Y.

  Next, in step S54, among the overlapping sector addresses, the sector address n-2 of the area X is preset with the sector address n-2 of the area Y as a set. Moves from the position reaching the sector address n + 5 of the Z section toward the area Y of the inner circumference, searches the sector address n-2 designated in the area Y section, and obtains the sector data Y-2 corresponding thereto .

At this time, in the authenticity determination program 50, since the area is not designated for the area X part, the area Y part, and the area Z part, only the duplicate sector address value is designated, so that the copied disk (CD-R) In this case, since the area Y does not exist, the optical pickup 15 searches again for the sector address n-2 designated in advance in the area X.

The operations in steps S53 to S54 described above use the sector read program 70. The operation of the sector read program 70 will be described later with reference to FIGS.

  Next, in step S55, the sector data Y-2 acquired in step S54 is stored in the second memory M2 provided in the controller 11 (FIG. 3).

  Next, in step S56, a comparison unit (not shown) provided in the controller 11 (FIG. 3) with the sector data X-2 stored in the first memory M1 and the sector data Y-2 stored in the second memory M2. If the sector data X-2 and the sector data Y-2 are different from each other (in the case of NO), the process proceeds to step S57. On the other hand, the sector data X-2 and the sector data Y-2 are If they are the same (YES), the process proceeds to step S58.

  Next, in step S57, since the sector data X-2 and the sector data Y-2 are different from each other, a discriminating unit (not shown) provided in the controller 11 (FIG. 3) uses a disc (CD-ROM1). Is determined to be genuine, and the operation of the authenticity determination program 50 is terminated. That is, the area Y part is present, and the disk is determined to be genuine, and thereafter, the start of the sector reading program is instructed as necessary.

  On the other hand, in step S58, since the sector data X-2 and the sector data Y-2 are the same, the disc (CD) copied by the determination unit (not shown) provided in the controller 11 (FIG. 3). -R), the operation flow of the authenticity determination program 50 is terminated. That is, since the area Y part does not exist, it is determined that the disc is a copy product, and then the CD-ROM application software is restarted as necessary. A warning such as “I cannot do it” may be issued.

  Next, when reading each sector data of a plurality of sectors recorded on the CD-ROM with the optical pickup 15 in order to read a portion where a sector address partially overlaps among the plurality of sectors, FIG. As shown in FIG. 10 using the sector reading program 70 of the information recording medium shown in FIG. 10, after reading the area X part having a small sector address with the optical pickup 15, the area Y part is read without reading the area Y part. A predetermined sector address in the area Z having a larger sector address is searched to reach an area Y where the sector address partially overlaps from this position toward the inner periphery, and thereafter, the area Y and area Z The parts are read in order.

  That is, in FIG. 9 and FIG. 10, when the operation flow of the sector reading program 70 is started, the optical pickup 15 is moved 5-10 sectors before the target sector address in step S71.

  Next, in step S72, a predetermined sector address search / predetermined sector data acquisition is performed in the area X part. At this time, a sector address range is set in advance in the area X. For example, address search and sector data acquisition are sequentially performed according to the data reading order (4-1) from sector address n-5 to sector address n.

  Next, in step S73, the area Y part following the area X part is not read, and for example, the sector address n + 5 is searched as a predetermined sector address in the area Z part having a sector address larger than the area Y part.

  Next, in step S74, the vicinity of the head sector address in the area Y portion to be the next target is designated from a predetermined sector address position (for example, the position of sector address n + 5) in the area Z portion, and the sector address designated here is, for example, The sector address n-4 is address searched in the data reading order (4-2).

  Next, in step S75, a predetermined sector address search / predetermined sector data acquisition is performed in the area Y. Here, address search and sector data acquisition are sequentially performed according to the data reading order (4-3) from sector address n-4 to sector address n in the area Y portion designated in step S74. Thereafter, the optical pickup 15 sequentially performs address search and sector data acquisition in the area Z portion following the area Y portion.

  Thus, according to the procedure of the data reading order (4-1), (4-2), and (4-3) by the sector reading program 70, the sector address overlaps at the Nth time (where N is a natural number). After reading the sector data in order from the smallest sector address with respect to the duplicate sector address part that appeared in the field, the duplicate sector address part that appeared N + 1 is not read, and the sector address is larger than the duplicate sector address part that was not read Search toward the head of the overlapping sector address part appearing at the (N + 1) th time from the direction, and then read the sector data in order from the heading side of the overlapping sector address part appearing at the (N + 1) th time toward the larger sector address. Therefore, the sector data of the overlapping sector address part which cannot be read by the usual method It can be read indeed.

  At this time, as described above, at least two or more overlapping sector address parts appearing at the N + 1th time among the overlapping sector address parts are serialized, so that the head of the overlapping sector address part appearing at the N + 1th time is obtained. However, the sector addresses n-4 and n-3 near the beginning of the area Y appearing at the (N + 1) th time can be easily read in some CD-ROM drives 10, but if necessary, To set the search area.

  Further, regarding the sector reading to the CD-ROM 1, the general CD-ROM drive 10 checks the increase of the sector address number, and when the same sector address appears, it is usually read by ignoring the same sector address. However, some CD-ROM drives 10 do not check the sector address value and output only the number of sectors specified from the start sector address. In such a CD-ROM drive 10, there is a possibility that an overlapping sector address part in the CD-ROM 1 of the first embodiment is detected. As a countermeasure, error-correctable data is included in the sector data corresponding to the overlapping sector address part in the area Y. For example, by setting the sector address n-4 on the head side of the area Y section to an unreadable sector, the cache memory (not shown) in the CD-ROM drive 10 is reset at the time of sector reading, and the area Y section Reading of the overlapping sector address portion of each other can be prevented.

  Specifically, setting the sector address n-4 on the head side of the area Y as an unreadable sector means, for example, a state in which sector data cannot be read because it cannot be physically or logically corrected, in other words, The sector data Y-4 corresponding to the sector address n-4 in the area Y part may be made error-correctable data.

  Next, a CD-ROM obtained by partially modifying the sector arrangement of the first embodiment will be briefly described with reference to FIG.

  FIG. 11 is a diagram for explaining a sector arrangement in a CD-ROM obtained by partially modifying the first embodiment.

  In the modification of the first embodiment shown in FIG. 11, the sector arrangement of the area Y portion is partially deformed and formed as the area Y ′ portion in the CD-ROM 1 of the first embodiment described above with reference to FIG. There are an area X part, an area Y ′ part, and an area Z part in this order from the inner circumference side to the outer circumference side of the disk.

  Here, only the region Y ′ portion of the region X portion, the region Y ′ portion, and the region Z portion is deformed with respect to FIG. 5, and this region Y ′ portion has a larger address value in the region X portion. The sector address n, n, n, n, n, which is the same as the last sector address n, is given in duplicate, and the sector corresponding to the duplicate sector address n, n, n, n, n Data is recorded with contents different from Y′1, Y′2, Y′3, Y′4, and Y′5.

  At this time, as described above, if error-correctable data is included in the sector data corresponding to the overlapping sector address portion in the region Y ′, the overlapping sector address portion in the region Y ′ is the same as in the first embodiment. Can be read.

  In addition, when overlapping sector address parts are provided not only on the inner circumference side of the disk but also on the inner circumference side of the disk or on the outer circumference side of the disk, the plural sector address parts are provided with a plurality of spaced intervals. By assigning a sector address value different from the overlapping sector address part on the inner circumference side of the disk, illegal copying becomes more difficult.

  Here, the sector address n assigned to the area X part is the overlapping sector address part that appears N times (where N is a natural number), and the sector address n assigned to the area Y ′ part is the duplicate that appears N + 1 times. Assuming that the sector address part is the area X part and the area Y 'part set on the inner circumference side of the disk from the above description, for example, the N = 1th overlapping sector address part appears in the area X part, and the area' Y For example, the N = 2th duplicate sector address portion appears in the section.

  At this time, the overlapping sector address part that appears N + 1 times the overlapping sector address part that appears N times is at least the same sector address as the last sector address having a larger address value among the N-th overlapping sector address parts. Since the Nth overlapping sector address part and the N + 1th overlapping sector address part are continued on the recording track, two or more overlapping sector address parts are easily read at the time of sector reading.

  Even in this case, even if illegally copied to the CD-R, the area Y 'is lost, so that illegal copying to the CD-R can be completely prevented and copyright infringement can be prevented.

  Along with the above, it is also necessary to change a part of the authenticity determination program. In this case, the last sector address n of the area X portion overlaps from the area Z portion side toward the region Y ′ portion side. By specifying sector address n in advance and determining whether or not a set of sector data corresponding to this set of sector addresses is different from each other, authenticity can be determined.

  Along with the above, it is also necessary to partially change the sector reading program. In this case, steps S74 and S75 may be changed in the steps of the sector reading program described above with reference to FIG. Since steps S71 to S73 can be used as they are, only the changes to steps S74 and S75 will be described here.

  That is, in the changed step S74, when the vicinity of the head sector address of the next target area Y ′ from the position of the sector address n + 5 is designated as the predetermined sector address in the area Z, the area Y from the area Z It is only necessary to designate overlapping sector addresses toward the “part side” and perform an address search for the sector address n near the beginning of the area Y ′ part in the data reading order (5-2).

  Further, in the changed step S75, the address search and the sector data acquisition are performed by the optical pickup 15 from the sector address n near the head in the designated area Y ′ to the last sector address n in the same area Y ′. The reading may be sequentially performed according to the reading order (5-3), and then the address search and the sector data acquisition may be sequentially performed in the area Z portion following the area Y ′.

12A and 12B are diagrams for explaining the second embodiment according to the present invention. FIG. 12A shows the entire configuration of the information recording medium (CD-ROM) of the second embodiment according to the present invention, and FIG. Figure showing free removable memory,
FIG. 13 is a configuration diagram for explaining a state in which the removable memory shown in FIG. 12B is connected to the controller in the CD-ROM drive.

  The overall configuration of the information recording medium (CD-ROM) 2 of the second embodiment according to the present invention shown in FIG. 12A is the same as the information recording medium (CD-ROM) of the first embodiment described above with reference to FIG. ) The configuration is the same except for the entire configuration 1 and a part of the configuration. Here, for convenience of explanation, only different points will be described with respect to the first embodiment by assigning new components to different components.

  As shown in FIG. 12 (a), the information recording medium (hereinafter referred to as CD-ROM) 2 of Example 2 according to the present invention leads from the inner periphery to the outer periphery of a disk substrate formed in a disk shape. An in area 2a, an ISO file system area 2b, a user data area 2c, and a lead-out area 2d are sequentially formed along a spiral recording track.

  Here, the point that the application software area is not provided between the ISO file system area 2b and the user data area 2c is different from the first embodiment, and is recorded in the user data area 2c. The plurality of sectors has the same structure as that of the first embodiment, and the sector arrangement is also exactly the same as the first embodiment and a modification obtained by partially modifying the first embodiment.

Accordingly, the application software area for storing at least the information recording medium authentication program 50 shown in FIG. 8 and the information recording medium sector reading program 70 shown in FIG. As shown in FIG. 5, the application software storage unit 3 a in the removable memory 3 is portable and can be attached to and detached from the CD-ROM driver 30 improved as described later.
The above-mentioned removable memory 3 is formed in a substantially card shape, and is roughly composed of an application / software storage unit 3a such as an IC memory and a connector unit 3b for electrically connecting to the improved CD-ROM driver 30. If necessary, it is protected by a protective cover (not shown).

  As shown in FIG. 13, when the removable memory 3 is connected to the controller 11 in the improved CD-ROM driver 30, an authentication program 50 (FIG. 8) stored in the application / software storage unit 3a, The sector reading program 70 (FIG. 9) is started by a command from the personal computer, and the operation steps of both the programs 50 and 70 are sent to the controller 11. Therefore, the controller 11 follows the operation steps of both the programs 50 and 70. Is controlling. Of course, the authenticity determination operation using the authenticity determination program 50 (FIG. 8) and the sector read operation using the sector read program 70 (FIG. 9) are exactly the same as those in the first embodiment, and thus the description thereof is omitted.

  It should be noted that without connecting the removable memory 3 to the controller 11 in the improved CD-ROM driver 30, the authenticity determination program 50 (FIG. 8) and the sector reading program 70 (FIG. 9) are connected to the controller 11 on the Internet line 31. It is also possible to send it in via

[Application Examples of Examples 1 and 2]
In the application example (1) of the first and second embodiments, when the authenticity of the CD-ROM 1 (or CD-ROM 2) is determined using the authenticity determination program 50 shown in FIG. The sector data X-2 corresponding to the sector address n-2 in the X section is not acquired from the sector, but the sector data X-2 is recorded in advance in another area of the disk. This is the same except that the sector data X-2 is extracted from the area by the optical pickup 15 and stored in the first memory M1.

  Next, in the application example (2) of the first and second embodiments, the authenticity of the CD-ROM 1 (or CD-ROM 2) is determined using the authenticity determination program 50 shown in FIG. , 2 application example (1), and in step S54 in FIG. 8, the sector data Y-2 corresponding to the sector address n-2 in the area Y is encrypted and recorded in advance with a secret key. The encrypted sector data Y-2 is read out and stored in the second memory M2. The sector data X-2 previously recorded in the other area of the disk and stored in the first memory M1 according to the above application example (1) is the encrypted sector data Y− stored in the second memory M2. 2 is related mathematically and logically. After that, when comparing the sector data X-2 and the sector data Y-2 in step S56 in FIG. 8, it is compared whether or not they are the same based on information related mathematically and logically. Just do it. At this time, in the case of a copied disk (CD-R), since this association cannot be matched, it can be processed as an illegally copied disk (CD-R).

  In the first embodiment, the modified example of the first embodiment, and the application examples (1) and (2) of the second embodiment and the first and second embodiments, a plurality of sectors recorded on the CD-ROM 1 (or CD-ROM 2). The method of searching for each sector address has been described, but the CD-ROM 1 (or CD-ROM 2) also has sub-code addresses in addition to the sector address. Accordingly, whether the value of the subcode is changed in substantially the same manner as the sector address or independently is changed depending on the function of the CD-ROM drive 10. Therefore, a method of changing the value of the subcode in the CD-ROM 1 (or CD-ROM 2) according to the present invention in substantially the same manner as the sector address instead of the sector address is also possible.

  In the sector reading operation in the CD-ROM 1 (or CD-ROM 2), as a sector reading method for the area Y part (or area Y ′ part) having a sector address partially overlapping with the area X part, The subsequent area Y part (or area Y ′ part) is not read, and after searching for a predetermined sector address in the area Z part where the sector address is larger than the area Y part (or area Y ′ part), from this position to the inner circumference side The method of reading the region Y portion (or region Y ′ portion) and the region Z portion in order after reaching the region Y portion (or region Y ′ portion) where the sector address partially overlaps is disclosed. By modifying the hardware of the ROM drive 10, it is also possible to read the area X part and the area Y part (or the area Y ′ part) continuously and obtain different sector data of the same sector address. However, it goes without saying that the reading method based on this is a category of the application example of the present invention.

  The information recording medium according to the present invention has been described with respect to a CD-ROM. However, the present invention is not limited to this, and the technical idea of the present invention is applied to a DVD-ROM or a next-generation ultra-high-density information recording medium. Can also be applied.

It is the figure which showed typically the sector structure at the time of applying Mode1 which is a typical format in read-only CD-ROM. It is a figure for demonstrating the sector arrangement | sequence of the information signal recorded on the conventional CD-ROM, (a) shows the order which reads each sector along a sector arrangement | sequence, (b) is the sector address and sector of each sector. It is the figure which showed data correspondingly. It is a block diagram for demonstrating a general CD-ROM drive. It is the figure which showed the whole structure of the information recording medium (CD-ROM) of Example 1 which concerns on this invention. It is a figure for demonstrating the sector arrangement | sequence of the information signal recorded on the information recording medium (CD-ROM) of Example 1 which concerns on this invention, (a) shows a sector arrangement | sequence order, (b) shows each sector. It is the figure which showed the sector address and sector data correspondingly. 2A and 2B are diagrams for explaining an operation when the information recording medium (CD-ROM) of Example 1 according to the present invention is illegally copied, where FIG. 1A shows a sector read operation, and FIG. It is the figure which showed correspondingly the sector address and sector data of each sector at the time. It is a figure for demonstrating the sector arrangement | sequence on CD-R after illegally copying the information recording medium (CD-ROM) of Example 1 which concerns on this invention, (a) shows a sector arrangement | sequence order, ( b) is a diagram showing the sector address and sector data of each sector in association with each other. It is the flowchart which showed operation | movement of the authenticity determination program of the information recording medium (CD-ROM) of Example 1 which concerns on this invention. It is the flowchart which showed the operation | movement of the sector reading program of the information recording medium (CD-ROM) of Example 1 which concerns on this invention. 4A and 4B are diagrams for explaining an operation when the information recording medium (CD-ROM) according to the first embodiment of the present invention is normally reproduced. FIG. 5A shows a sector read operation, and FIG. It is the figure which showed correspondingly the sector address and sector data of each sector when it performed. FIG. 6 is a diagram for explaining a sector arrangement in a CD-ROM in which Example 1 is partially modified. It is a figure for demonstrating Example 2 which concerns on this invention, (a) shows the whole structure of the information recording medium (CD-ROM) of Example 2 which concerns on this invention, (b) is a removable removable. It is the figure which showed the memory. It is a block diagram for demonstrating the state which connected the removable memory shown in FIG.12 (b) to the controller in a CD-ROM drive.

Explanation of symbols

1 ... CD-ROM of Example 1,
1a ... lead-in area, 1b ... ISO file system area,
1c: Application software area, 1d: User data area,
1e ... lead-out area,
2 ... CD-ROM of Example 2,
2a ... Lead-in area, 2b ... ISO file system area,
2c: User data area, 2d: Lead-out area,
3 ... Removable memory, 3a ... Application software storage,
10 ... CD-ROM drive, 11 ... controller,
12 ... Spindle motor drive circuit, 13 ... Spindle motor,
14 ... turntable, 15 ... optical pickup, 16 ... pickup support,
17 ... Information signal processing circuit, 18 ... Focus servo circuit,
19 ... Tracking servo circuit, 20 ... Optical pickup coarse adjustment circuit,
21 ... interface circuit,
30 ... Improved CD-ROM drive, 31 ... Internet connection.

Claims (5)

Sector addresses and sector data are recorded in the user data area across a plurality of sectors in units of sectors, and the plurality of sectors are given partly overlapping while the sector addresses tend to increase sequentially. In an information recording medium,
The N + 1th overlapping sector address portion appearing after the overlapping sector address portion appearing at the Nth time (where N is a natural number) is the final sector address n having the largest address value among the Nth overlapping sector address portions. And the sector address n + 1 that is one greater than the sector address n, and at least two or more of the sector addresses in the Nth overlapping sector address portion are assigned in sequence, An information recording medium, wherein the sector data corresponding to the N + 1th overlapping sector address portion is recorded differently with respect to the Nth overlapping sector address portion. Sector addresses and sector data are recorded in the user data area across a plurality of sectors in units of sectors, and the plurality of sectors are given partly overlapping while the sector addresses tend to increase sequentially. In an information recording medium,
The N + 1th overlapping sector address portion appearing after the overlapping sector address portion appearing at the Nth time (where N is a natural number) is the final sector address n having the largest address value among the Nth overlapping sector address portions. And the sector address n + 1 that is one greater than the sector address n, and at least two or more of the sector addresses in the Nth overlapping sector address portion are assigned in sequence, The sector data corresponding to the N + 1th overlapping sector address portion is recorded differently with respect to the Nth overlapping sector address portion, and error correction is performed in the sector data corresponding to the N + 1th overlapping sector address portion. An information recording medium characterized by including impossible data. Sector addresses and sector data are recorded in the user data area across a plurality of sectors in units of sectors, and the plurality of sectors are given partly overlapping while the sector addresses tend to increase sequentially. The N + 1th overlapping sector address portion that appears after the overlapping sector address portion that appears at the Nth time (where N is a natural number) is the last sector having the largest address value among the Nth overlapping sector address portions. Arranged between the address n and a sector address n + 1 which is one greater than the sector address n, and at least two or more of the sector addresses in the Nth overlapping sector address portion are assigned in sequence, , The sector data corresponding to the N + 1th overlapping sector address portion is the Nth overlapping sector address portion. An information recording medium which is recorded differently for,
Determining authenticity based on whether or not at least one set of sector data corresponding to the same sector address is different between the Nth overlapping sector address part and the N + 1th overlapping sector address part. An information recording medium, wherein an authenticity determination program is recorded in an area different from the user data area. Sector addresses and sector data are recorded in the user data area across a plurality of sectors in units of sectors, and the plurality of sectors are given partly overlapping while the sector addresses tend to increase sequentially. The N + 1th overlapping sector address portion that appears after the overlapping sector address portion that appears at the Nth time (where N is a natural number) is the last sector having the largest address value among the Nth overlapping sector address portions. Arranged between the address n and a sector address n + 1 which is one greater than the sector address n, and at least two or more of the sector addresses in the Nth overlapping sector address portion are assigned in sequence, , The sector data corresponding to the N + 1th overlapping sector address portion is the Nth overlapping sector address portion. A authenticity determination method of determining the information recording medium authenticity differently recorded information recording medium for,
The authenticity is determined based on whether at least one set of sector data corresponding to the same sector address is different between the Nth overlapping sector address part and the N + 1th overlapping sector address part. A method for determining the authenticity of an information recording medium. Sector addresses and sector data are recorded in the user data area across a plurality of sectors in units of sectors, and the plurality of sectors are given partly overlapping while the sector addresses tend to increase sequentially. The N + 1th overlapping sector address portion that appears after the overlapping sector address portion that appears at the Nth time (where N is a natural number) is the last sector having the largest address value among the Nth overlapping sector address portions. Arranged between the address n and a sector address n + 1 which is one greater than the sector address n, and at least two or more of the sector addresses in the Nth overlapping sector address portion are assigned in sequence, , The sector data corresponding to the N + 1th overlapping sector address portion is the Nth overlapping sector address portion. A authenticity determination program determines the information recording medium authenticity differently recorded information recording medium for,
Determining authenticity based on whether or not at least one set of sector data corresponding to the same sector address is different between the Nth overlapping sector address part and the N + 1th overlapping sector address part. An information recording medium authentication program characterized by being stored.

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