JP3920884B2 - Information recording / playback device compatible with copy protection - Google Patents

Description

  The present invention relates to a recordable / reproducible information recording medium and a recording / reproducing apparatus thereof, and particularly to an information recording medium and a recording / reproducing apparatus corresponding to copy protection.

  A recordable / reproducible DVD (digital versatile disc) has been developed. These discs include a recordable DVD (hereinafter referred to as DVD-R) and a rerecordable DVD (hereinafter referred to as DVD-RW). Since these information recording media can record a large amount of video data, audio data, and computer data, it is considered that media identification information for preventing unauthorized copying is recorded on the information recording media in advance. ing.

  For identification of DVD-ROM and DVD-R and identification of DVD-ROM and DVD-RW, book type identification code and groove wobble detection recorded on these media can be used. In addition to these pieces of identification information, it has been considered to use other media identification information for encryption key information for encrypting and recording content.

  The media identification information is considered to be a combination of two pieces of identification information, and is recorded in a different form on the information recording medium. In any case, the identification information must be formed on the information recording medium so that it cannot be rewritten and changed.

  If these pieces of identification information are identification information A and identification information B, the identification information A is recorded as NBCA (non-burst cutting area) information in the DVD-RW. The identification information B is not yet determined.

  In the present invention, the identification information A is individual identification information of the disc itself, and the serial number of the disc is recorded by cutting. The identification information B is at least disc license information, and is, for example, information such as copy prohibition, copying permitted once or copying permitted twice.

  In the rewritable DVD (DVD-RAM), the identification information A is recorded as BCA (burst cutting area) information. The identification information B can be recorded as emboss information in the lead-in area.

  For DVD-R discs, both identification information A and identification information B are not yet determined.

  In Japanese Patent Laid-Open No. 11-86436, when information is reproduced from a recordable digital information recording medium such as a DVD-RAM, information extracted and read from digital watermark information is recorded on the recording medium. A system for determining whether the information is original by comparing the obtained information is described. However, there is no mention of how this system is specifically realized on a DVD-R or DVD-RW disc.

  Japanese Patent Laid-Open No. 11-355711 describes multiplexed anti-duplication signals, but does not mention the arrangement of identification information on a medium.

  Japanese Patent Application Laid-Open No. 10-105975 describes BCA (burst cutting area) recording, but does not refer to other identification information.

  Japanese Patent Application Laid-Open No. 10-105974 describes BCA recording, but does not refer to other identification information.

  As described above, the identification information A is recorded as NBCA information in the DVD-RW, but the identification information B is not yet determined. Further, regarding the DVD-R disc, the identification information A and identification information B are still undecided.

  Therefore, the present invention provides an information recording medium, a recording method, and a recording / reproducing apparatus corresponding to copy protection that can use the identification information B of the DVD-RW, the identification information A of the DVD-R, and the identification information B. The purpose is to provide.

In the apparatus of the present invention, the additional recording or rewritable information recording medium is recorded with embossed or pre-pit identification information indicating whether copying is permitted or not in a readable lead-in area where information cannot be rewritten. In addition, a specific fixed value is written in a plurality of border- in areas that are different from the lead-in area and in which the identification information can be added or rewritten , and the identification information is copied or altered and written therein. Or a means for reading and storing the identification information recorded in the emboss or pre-pit, and a plurality of border-ins. Means for reading information written in any of the areas, the read information and the stored identification When comparing the distribution, if the content of either match or read information is different from the fixed value, characterized in that and means for the stop or warning playback.

In order to prevent the identification information B embossed or pre-recorded in the specific area as described above from being modified and copied to another disk management area, a specific fixed value (for example, all zero) is automatically set in the other disk management area. To prevent unauthorized use of identification information.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows a data structure of a lead-in area of an information recording medium (for example, DVD-R) according to the present invention. As shown in FIG. 1, the lead-in area includes a disk information 1 area and a disk information 2 area. A buffer area is secured next to the disk information 1 area. The numbers on the left side of the enlarged view of the disk information 1 and disk information 2 indicate relative sector numbers. The blank area in which nothing is described in the lead-in area is reserved for recording other information necessary for disk management (for example, initial values, reference codes, etc.), and for a reservation or buffer area.

  In the area of disk information 2, a reserved area, an area of disk manufacturer information, an area of disk physical information (including the last address), and a reserved area are secured.

  In the area of disk information 1, an area for disk manufacturer information (the same contents as the contents of disk information 1), an area for disk physical information (including the last address), and a reserved area for system use are secured. Yes.

  Here, in the present invention, information by pre-recording or embossing is recorded in the reserved area for system use for copy protection.

  FIG. 2 shows the contents of the buffer area 2, and there are a border-out area and a border-in area as shown in FIG.

  The border-out area and the border-in area are described in units of ECC blocks as shown in FIG. 2B, and include the sector address of the current border-out area and the next border-in area. ing. As shown in FIG. 2C, an area for disc information 3 is further secured particularly in the border-in area. Here, information having the same contents as the previous disc information 1 can be recorded.

  FIG. 3 shows the configuration of the border zone written in the data area when data is added and recorded.

  As shown in FIG. 3 (A), the configuration of the border area used in the data addition is composed of a border-out area and a border-in area, and the border-in area is updated as shown in FIG. 3 (B). Further, the contents of the disc information 4 (this format is the same as the content shown in FIG. 2 (disc information 1)) is recorded at the end of addition.

  Here, since information by embossing or pre-recording is formed in the area reserved for user use of the disc information 1, the contents of the recorded data itself cannot be rewritten or changed. Therefore, recording the identification information B in the reserved area of this area by embossing or pre-recording satisfies the requirement that the data required for the identification information B cannot be rewritten or changed. Further, if the identification information B is recorded in the area of the disc information 1, it can be formed by embossing or pre-recording at a time when the disc is manufactured, which is convenient for manufacturing the disc.

  As described above, it is possible to rewrite the contents of the identification information B itself in the specific area or change the contents by using the pre-recording or embossed recording as the disc information B as the identification information B. Can not. Therefore, when this disk is used, if the contents of this disk are not permitted to be copied, the object can be achieved by writing the copy permission information into the identification information B itself. That is, in this case, when the recording / reproducing apparatus reproduces the DVD-R and tries to copy it to another disk, the recording / reproducing apparatus determines that copying is not permitted from the contents of the identification information B.

  Next, still another embodiment of the present invention will be described.

  In the recording / reproducing apparatus, when the identification information B is recorded in the disk information 1 area, the disk information 1 is stored in the disk information 2 area, the disk information 3 area, and the data area which are different disk management areas. The updated contents are copied to the disk information 4 area. When updating, basically, the disc information B is recorded as it is in the reserved area, and is added to the disc physical information area in the form of the current border-out address and the next border-in address.

  Since both the disc information area and the border area can be recorded later by the drive, it is possible to record the disc information in these separate areas as the disc management information area in a state where the identification information B is intentionally changed or altered. Is possible. This is a problem in terms of security of the identification information B.

  That is, as shown in FIG. 4, the disc information 1 (identification information B) recorded in the lead-in area is changed to the disc information 2 area, the buffer area (in the lead-in area), and the border-in area in the data area. If it is possible to record the disc in a state where it is intentionally changed or altered, there is a possibility that the contents of this disc can be copied to another disc. This is because, as described above, the identification information B in the identification information is at least license information of the disc, for example, information such as copy prohibition or copying permitted once or copying permitted twice. It is.

  If the identification information B is altered as it is, the contents of the disk information 1 are ignored, and if the system management is performed based on the other disk information 2, 3, 4, etc., copying to the next disk becomes possible. is there.

  Therefore, next, in the present invention, the identification information B is formed in the disk information 1 area by embossing or pre-recording. First, this area is prevented from being changed or rewritten, and further to the disk information 2 or disk information 3 or 4 area. It is possible to prohibit the alteration and recording of the identification information B.

  For this purpose, for example, the sector 0 and the sectors 3 to 15 in the area of the disk information 2 shown in FIG. 1 are reserved, and the reserved sector as shown in FIG. A fixed value is recorded such as 00h.

  Also, the disc information 3 at the border-in unit positions 25 to 29 shown in FIG. 2 is the disc information 6 as shown in FIG. 6, and the sectors 2 to 15 are specified as All 00h. The fixed value of is recorded.

  FIG. 6 shows the contents of the buffer area 2, and there are a border-out area and a border-in area as shown in FIG. The border-out area and the border-in area are described in units of ECC blocks as shown in FIG. 6B, and include the sector address of the current border-out area and the next border-in area. ing. As shown in FIGS. 6C and 6D, an area for disc information 6 is further secured particularly in the border-in area.

  Furthermore, also in the border zone in the data area, as shown in FIG. 7, the disc information of sectors 2 to 15 to be described in the border-in is disc information 7 and a specific fixed value such as All 00h is recorded. . FIG. 7A shows the arrangement of border-out and border-in, and FIG. 7B shows the unit positions and contents of the border-out and border-in. FIG. 7C shows the contents of the disc information recorded on the border-in.

  As a result, the identification information B is recorded only in the embossed or pre-recorded area (disc information 1), and no copy of the identification information B or altered contents are recorded in the other recordable areas.

  That is, in the present invention, as described above, the disc information 5 as shown in FIGS. 5, 6 and 7 is used as the disc information at the location corresponding to the disc information 2 and 3 and the location corresponding to the border-in disc information 4. , 6 and 7 are recorded. As a result, all the positions corresponding to the disc information 2, 3 and 4 are fixed values, and therefore the identification information B recorded as the disc information 1 cannot be copied or altered and recorded at a recordable location. Therefore, even if information in which the identification information B is recorded in this way is recorded on another disc, even if the border-in identification information is judged and copied to another disc, the content of the identification information is a fixed value. For this reason, the judgment side becomes an error and cannot be duplicated.

  The present invention is not limited to the above embodiment.

  In the above description, the DVD-R form and its copy protection recording have been described. However, the present invention can be similarly applied to DVD-RW.

  In the DVD-RW, as shown in FIG. 8, there are a disc information 1A region and a disc information 2A region in the lead-in region of the disc. In the disk information 2A area, a reserved area, a disk manufacturer information area, a disk physical information area, and a reserved area are secured.

  Further, in the area of the disc information 1A, when this is recorded in an unreadable emboss, disc manufacturer information is recorded as the contents. In this case, this portion cannot be reproduced in practice, and data cannot be recorded in this portion.

  However, in the present invention, this area is made readable so that the information is readable and recorded with embossing to obtain copy protection. Therefore, disk physical information, disk manufacturer information, and a reserved area for system use are provided.

  A buffer area is provided next to the disc information 1A. Border-out and border-in areas as shown in FIG. 9 are secured here. An area for recording the disc information 3A is secured in the border-in area.

  FIG. 9 shows the contents of the buffer area. As shown in FIG. 9A, there are a border-out area and a border-in area. The border-out area and the border-in area are described in units of ECC blocks as shown in FIG. 9B, and include the sector address of the current border-out area and the next border-in area. ing. As shown in FIG. 9C, an area for disc information 3A is further secured particularly in the border-in area. Here, information having the same contents as the previous disc information 1A can be recorded.

  FIG. 10 shows the configuration of a border zone that is written in the data area when data is added and recorded.

  As shown in FIG. 10 (A), the configuration of the border area used in the data addition is composed of a border-out area and a border-in area, and the border-in area is updated as shown in FIG. 10 (B). The disc information 4A (this format is the same as the content shown in FIG. 8 (disc information 1A)) is recorded last.

  Here, since information is formed by embossed recording in the reserved area for user use of the disc information 1A, the contents of the recorded data itself cannot be rewritten or changed. Therefore, recording the identification information B by embossing in the reserved area of this area satisfies the requirement that the data required for the identification information B cannot be rewritten or changed. Further, if the identification information B is recorded in the area of the disc information 1A, it can be formed by embossing or pre-recording at a time when the disc is manufactured, which is convenient for manufacturing the disc.

  As described above, when the identification information B is the disc information B and the recording is performed by embossing, the contents of the identification information B itself in the specific area cannot be rewritten to the specific area or the contents cannot be changed. Therefore, when this disk is used, if the contents of this disk are not permitted to be copied, the object can be achieved by writing the copy permission information into the identification information B itself. In other words, in this case, when the recording / reproducing apparatus reproduces the DVD-RW and tries to copy it to another disk, the recording / reproducing apparatus determines from the contents of the identification information B that copying is not permitted.

  Next, still another embodiment of the present invention will be described.

  In the recording / reproducing apparatus, when the identification information B is recorded in the disk information 1 area, the disk information 1A is stored in the disk information 2A area, the disk information 3A area, and the data area, which are different disk management areas. The updated contents are copied to the disk information 4A area. When updating, basically, the disc information B is recorded as it is in the reserved area, and is added to the disc physical information area in the form of the current border-out address and the next border-in address.

  Since both the disc information area and the border area can be recorded later by the drive, it is possible to record the disc information in these separate areas as the disc management information area in a state where the identification information B is intentionally changed or altered. Is possible. This is a problem in terms of security of the identification information B.

  That is, as shown in FIG. 4, the disc information 1 (identification information B) recorded in the lead-in area is changed from the disc information 2 area, the buffer area (in the lead-in area), and the border in the data area. Being able to record in the area of IN in a state where it is intentionally changed or altered, there is a possibility that the contents of this disc can be copied to another disc. This is because, as described above, the identification information B in the identification information is at least license information of the disc, for example, information such as copy prohibition or copying permitted once or copying permitted twice. It is.

  If the identification information B is altered as it is, the contents of the disk information 1A are ignored, and if the system management is performed based on the other disk information 2A, 3A, 4A, etc., copying to the next disk becomes possible. is there.

  Therefore, next, in the present invention, the identification information B is formed in the disc information 1A area by embossing. First, this area is prevented from being changed or rewritten. It is possible to prohibit recording by altering.

  For this purpose, for example, the sector 0 and the sectors 3 to 15 in the area of the disk information 2A shown in FIG. 8 are reserved, and the reserved sector as shown in FIG. A fixed value is recorded such as 00h.

  Further, the disc information 3A at the border-in unit positions 25 to 29 shown in FIG. 9 is the disc information 6 as shown in FIG. 12, and the sectors 2 to 15 are specified as All 00h. The fixed value of is recorded.

  FIG. 12 shows the contents of the buffer area 2, and there are a border-out area and a border-in area as shown in FIG. The border-out area and the border-in area are described in units of ECC blocks as shown in FIG. 12B, and include the sector address of the current border-out area and the next border-in area. ing. As shown in FIGS. 12C and 12D, an area for disc information 6 is further secured particularly in the border-in area.

  Furthermore, also in the border zone in the data area, as shown in FIG. 13, the disc information of sectors 2 to 15 to be described in the border-in is set as disc information 7 and a specific fixed value such as All 00h is recorded. . FIG. 13A shows an arrangement of border-out and border-in, and FIG. 13B shows unit positions and contents of border-out and border-in. FIG. 13C shows the contents of the disc information recorded in the border-in.

  As a result, the identification information B is recorded only in the embossed recording area (disc information 1A), and no copy of the identification information B or altered contents are recorded in the other recordable areas.

  That is, in the present invention, as described above, the disc information 5A as shown in FIGS. 5, 6, and 7 is used as the disc information at the location corresponding to the disc information 2A and 3A and the location corresponding to the border-in disc information 4. , 6A, 7A are recorded. As a result, the positions corresponding to the disc information 2A, 3A, 4A are all fixed values, so that the identification information B recorded as the disc information 1A cannot be copied or altered at a recordable position. Therefore, even if information in which the identification information B is recorded in this way is recorded on another disc, even if the border-in identification information is judged and copied to another disc, the content of the identification information is a fixed value. For this reason, the judgment side becomes an error and cannot be duplicated.

  The present invention is not limited to the above embodiment.

  As shown in FIG. 8, the disc information 1A and 2A have areas for disc manufacturer information, disc physical information, and reservation. In both cases, the disc manufacturer information and the array of disc physical information are arranged. Are only different.

  After the identification information B in the disc information 2A is replaced with a fixed value (All 00h), the disc may be used again to be additionally written or rewritten. When a border zone is created at the end of the write data, the contents of the disc information 2A may be written in the border-in. Even in this case, the identification information B in the border-in disc information becomes a fixed value (All 00h), and the same effect as in the previous embodiment can be obtained. The contents of the disc information 2A may be written in the disc information 3A. Even in this case, the identification information B in the border-in disc information becomes a fixed value (All 00h).

  Next, a disc drive apparatus or recording / reproducing apparatus capable of recording / reproducing corresponding to DVD-R and DVD-RW will be described.

  FIG. 14 shows a schematic configuration of the recording / reproducing apparatus. The first disk 51 is rotated by a disk motor 51. The description begins with the playback mode. When information on the disk 51 is read, it is optically read by a laser output from the pickup 53. The laser emitted from the pickup 53 is reflected from the disk 51, and the reflected light is converted into an electric signal by the photoelectric conversion element. The high frequency signal is input to the high frequency amplifier 54 and amplified, and then input to the signal processing unit 55. The signal processing unit 55 performs binarization processing, error correction, demodulation, modulation processing, and the like of the high frequency signal. The signal processing unit 55 includes a signal processing means for reproduction and a signal processing means for recording.

  The demodulated audio information is input to the audio decoder 56 and decoded. The decoded audio signal is supplied to an audio amplifier. The demodulated main video information is decoded by the main video decoder 57. Also, sub-picture information obtained by encoding information such as movie subtitles is decoded by a sub-picture decoder 58. The main video and the sub video are synthesized by the synthesizer 59 and supplied to the display.

  Various management information decoded by the signal processing unit 55 is input to the system control unit 60 and analyzed, and becomes determination information for disc type, reproduction, and recording.

  Reference numeral 61 denotes a second disk, which is used as a buffer, for example. For example, the disk 61 is equivalent to a hard disk built in the recording / reproducing apparatus. The same applies when the recorded information on the disc 61 is reproduced. The first disk 61 is rotated by a disk motor 61. When information on the disk 61 is read, it is optically read by a laser output from the pickup 63. The laser emitted from the pickup 63 is reflected from the disk 61, and the reflected light is converted into an electric signal by the photoelectric conversion element. The high frequency signal is input to the high frequency amplifier 64 and amplified, and then input to the signal processing unit 55. The signal processing unit 55 performs high-frequency signal binarization processing, demodulation processing, and the like.

  Next, the path of the recording mode will be described.

  For example, when information once buffered on the second disk 61 is recorded on the second disk 51, the recording mode is set, information on the second disk 61 is reproduced, and the signal processing unit 55 receives the information. For example, 8/16 or 8/15 modulation processing is performed. This modulated signal is amplified and used as a drive signal for the laser diode of the pickup 53. As a result, information on the disk 61 is recorded on the disk 51.

  Conversely, when the information on the disc 51 is temporarily stored in the disc 61, the information on the disc 51 is reproduced. The data is read by the signal processing unit 55 and subjected to, for example, 8/16 or 8/15 modulation processing. This modulated signal is amplified and used as a drive signal for the laser diode of the pickup 63.

  FIG. 15 is a flowchart for explaining one of the main parts of the present invention, and the function for controlling this operation is set as a program of the system control unit 60.

  Now, it is assumed that the information of the second disc 61 is recorded on the first disc (for example, DVD-RW) according to the present invention.

  It is assumed that the original data is recorded as it is on the second disc 61. When recording is started, control data (disc information 1A) is first read from the first disc 51. In the disc information 1A, identification information B, disc manufacturer information, and disc physical information are recorded. From this content, the system control unit 60 determines the type of the first disc, whether it can be copied once, and the like. I can judge. Further, the identification information B can be used to generate key information for encrypting the content recorded in the data area. (Key information for decompressing the encrypted content at the time of reproduction can also be generated). The key information generated here is sent to the signal processing unit 55 to be used for encrypting the non-encrypted content, or at the time of reproduction, the encrypted content is decompressed into the non-encrypted content. (Steps E1, E2, E3).

  Now, in the recording mode, if the identification information B indicates that copying is possible once, the data recorded on the disk 61 is written, and when reading of the data on the disk 61 is terminated or a stop command is issued, the explanation will be given first. The new disc information 5A, 6A, 7A and the like are generated. Further, the last address information is generated according to the final position of the recording position, and the original final address is updated (step E5). Next, new disc information is recorded at a predetermined position of the border-in (step E6).

  At this time, as shown in the disc information 5A, 6A, and 7A, the identification information B is rewritten and recorded with a fixed value such as all zeros.

  Since the identification information B is also recorded on the second disc 61, the system control unit 60 creates key information for reproducing the information on the second disc 61 using the identification information B, and encrypts it. Can be decompressed (however, the content recorded on the disc 61 is encrypted).

  Next, it is assumed that the first disk 51 (for example, DVD-RW) on which data is recorded by the above-described method is used for reproduction. In this case, data is reproduced in the previous reproduction system.

  Next, it is assumed that the content of the first disk 51 on which data is recorded by the above-described method is temporarily stored in the second disk 61. Then, it is assumed that the contents of the disk 61 are copied to the new first disk 51 '. In this case, the border-in identification information B is recorded as shown in the disc information 5A, 6A, and 7A. As a result, even if the disc 61 is reproduced, the border-in identification information B is a fixed value, so the system control unit 60 determines that the identification information B is absent or abnormal, and stops or warns the copy operation. (Steps F1, F2, F3, F4).

  Next, if the information stored in the second disc 61 is original information, that is, if the formal identification information B exists at a position corresponding to the disc information 3, 4, 5, step F3. This is determined and copying starts (step F5).

  The present invention is not limited to the above embodiment.

  When recording information on a DVD-R or DVD-RW disc with a recordable information recording / reproducing apparatus compatible with DVD-R or DVD-RW, the information of disc information 1 is reproduced and the existence of identification information B is confirmed. To do. If the identification information B does not exist, data is recorded as a disc that does not support the identification information B. In the case of a disc that does not support the identification information B, all the data of the identification information B recorded in other recordable areas (disc information 5, 6, 7 and 5A, 6B, 7C) is 00h.

  When the identification information B exists, the data of the identification information B is held in a memory and used as key information for encrypting the data when recording user data.

  Although the data of the identification information B is held in the memory, it is prohibited to record the data content in a writable area of the disc.

  In FIG. 17, when such a disc is reproduced, the data of the identification information B reproduced from the disc information 1 is held in the memory (steps G1, G2, G3). If data other than 00h is detected from other recordable areas (disc information 5, 6, 7 or 5A, 6B, 7C), the same as the identification information B stored in the memory, or all data other than 00h is detected. Reproduction is prohibited (G4, G5), and otherwise reproduction is performed (G6).

  As a result, unauthorized use of the identification information B prerecorded or embossed as the disc information 1 is prevented.

  The present invention is not limited to the above embodiment. Although information recorded on a DVD-R or DVD-RW has been described as being recorded from a hard disk or another disk, it goes without saying that the present invention can also be applied when handling information distributed by wire or wirelessly.

  As described above, according to the present invention, the identification information B is recorded on the DVD-R and DVD-RW with embossing so that the user cannot rewrite, and a copy of the identification information B is recorded on the information recording medium. Unauthorized use of the identification information B can be prevented by preventing the apparatus from being duplicated or changed. In a recordable recording medium such as a DVD-R, the identification information B may be recorded by pre-recording instead of embossing.

Explanatory drawing which shows the data structure of the lead-in of DVD-R concerning this invention. FIG. 3 is an explanatory diagram showing a data structure of the buffer area in FIG. Explanatory drawing which shows the data structure of the border zone formed in the data area of FIG. Explanatory drawing which shows the relationship between a disc, lead-in, and a border zone. Explanatory drawing which shows the other example of the data content of the disc information which concerns on this invention. The figure which shows the other example of the data structure of the buffer area which concerns on this invention. Explanatory drawing which shows the other example of the data structure of the border zone formed in the data area which concerns on this invention. Explanatory drawing which shows the data structure of the lead-in of DVD-RW concerning this invention. FIG. 9 is an explanatory diagram illustrating a data structure of the buffer area in FIG. 8. Explanatory drawing which shows the data structure of the border zone formed in the data area of FIG. Explanatory drawing which shows the other example of the data content of the disc information based on this invention. Explanatory drawing which shows the other example of the data structure of the buffer area which concerns on this invention. Explanatory drawing which shows the other example of the data structure of the border zone formed in the data area which concerns on this invention. The figure which shows the structure of the recording / reproducing apparatus of the information recording medium of this invention. Explanatory drawing which shows the operation example of the apparatus of FIG. Explanatory drawing which similarly shows the operation example of the apparatus of FIG. Explanatory drawing which similarly shows the operation example of the apparatus of FIG.

Explanation of symbols

51, 61 ... Disc, 52, 62 ... Disc motor, 53, 63 ... Pickup, 54, 64 ... High frequency amplifier, 55 ... Signal processing unit, 56 ... Audio decoder, 57 ... Main video decoder, 58 ... Sub video decoder, 59 ... Synthesizer, 60 ... System controller.

Claims (2)

The additional recording or rewritable information recording medium has identification information indicating whether copying is permitted or not, recorded in an embossed or pre-pit with respect to a readable lead-in area where information cannot be rewritten. A specific fixed value is written in a plurality of border-in areas that are different from the above and in which the identification information can be added or rewritten , and the identification information is copied or altered to be written or the specific information is written. When the fixed value of is different data, it can be determined as an unauthorized disk,
Means for reading and storing the identification information recorded in the emboss or pre-pit;
Means for reading information written in any one of the plurality of border-in areas;
When the read information and the stored identification information are compared, if the information matches or the read information is different from the fixed value, information having a means for stopping or warning the reproduction Recording / playback device. It said means for reading a fixed value, the information reproducing apparatus according to claim 1, wherein the reading from the border-in area of the border-in area or data area in the buffer area.

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