JP2006040502A - Reproducing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reproducing apparatus by which unauthorized reproduction of principal information formed by unduly copying principal information such as digital AV content information is more strongly prevented to a conventional reproducing apparatus and as a result unauthorized copy of principal information can be more strongly prevented. <P>SOLUTION: A digital AV content being the principal information and decoding information needed for normally reproducing the digital AV content are recorded in respectively different layers of a disk 1. At first decoding information recorded in a CD layer 3 of the disk 1 is read and stored in a memory in the inside. Encoded or scrambled principal information recorded in a DVD layer 2 is then read and the encoded or scrambled principal information is restored to original normal information while the decoding information stored in the memory is utilized. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a playback apparatus that solves the problem of illegal copying of information such as digital AV content.

  Due to recent advances in LSI and optical disk recording / playback technologies, inexpensive digital recording devices and recording media are rapidly spreading. Accordingly, various methods for preventing unauthorized copying of digital AV content have been proposed. For example, a scramble (encryption) technique is introduced in a DVD (Digital Versatile Disc) that realizes high-quality video reproduction. Alternatively, a technique has been proposed that determines whether the inserted disc is an original or a copy disc, and prohibits the reproduction operation when the disc is an illegal copy disc, thereby producing an effect of suppressing illegal copy. In the former DVD, the decoding information necessary for restoring the scrambled main information to the original is recorded in the innermost area of the disc that is not normally accessible by the user to prevent unauthorized copying. The latter is a type of illegal copy prevention means for discriminating whether an inserted disc is an original or a copy disc, and an example of this is Japanese Patent Application Laid-Open No. 09-128301.

In Patent Document 1, a specific key code is recorded on an original disc in an area that is not normally accessible by a user, for example, an inner circumference lead-in area or an outer circumference lead-out area than an area where main information is recorded. Keep it. By recording the key code in this way, the key information cannot be copied even if the main information can be illegally copied. Therefore, the player can determine that the disc is not the original disc, and stops the reproduction operation and does not reproduce the illegally copied main information. As a result, illegal copying is prevented (illegal reproduction of illegally copied main information is prevented). Prevention).
JP 09-128301 A

  In the conventional illegal copy prevention measures, the decoding information and the key code, which are important for prevention, are devised so that they cannot be easily copied by recording them in a different area from the main information. However, since the decoding information and the key code are recorded on the same recording layer as the main information is recorded, on the PC system that has been widely used in general households these days, the popular name “whole copy” or “completely” By running a copy tool called “backup”, it has become possible for general users to copy decode information and key codes to recordable discs.

  Furthermore, the recordable disc that is the copy destination has the same recording capacity and reproduction compatibility as the read-only disc (ROM type) that is the original disc of the copy source. For example, recordable discs such as DVD-R for DVD and CD-R for CD are fully compatible with read-only discs after information is recorded. When the code is illegally copied, it is possible to reproduce the code without any difference from the original disc.

  In view of this, the present invention provides a conventional reproducing apparatus for illegal reproduction of main information obtained by illegally copying main information such as digital AV content information recorded on an original disc-shaped information recording medium (regular read-only disc). An object of the present invention is to provide a reproducing apparatus that can prevent the illegal copying of main information more effectively (and prevent illegal reproduction of illegally copied main information more effectively).

  Furthermore, the main information and the decode information are completely transferred to different recording layers of the same disk-shaped information recording medium, unless a recordable disk-shaped information recording medium having the same multilayer structure as the original disk-shaped information recording medium is supplied. It is an object of the present invention to provide a reproducing apparatus for a disk-shaped information recording medium that can prevent copying and, as a result, more effectively prevent illegal copying of main information.

In order to solve the above problems, the present invention provides the following playback device.
(1) In a reproducing apparatus for reproducing information from a disk-shaped information recording medium,
CD (Compact Disc) standard recording a recording layer compliant with the DVD (Digital Versatile Disc) standard on which encrypted or scrambled information is recorded, and decoding information for restoring the encrypted or scrambled information Reading means for reading each information from a disk-shaped information recording medium having a recording layer compliant with
Decode information storage means for temporarily storing the decode information read from the recording layer compliant with the CD standard;
Restoring means for restoring the encrypted or scrambled information read from the recording layer compliant with the DVD standard using the decode information supplied from the decode information storage means;
The information encoded or scrambled from the recording layer compliant with the DVD standard of the same disk-shaped information recording medium after the decoding information is read from the recording layer compliant with the CD standard of the disk-shaped information recording medium Control means for controlling the reading means so as to read
A playback apparatus characterized by comprising:
(2) In a reproducing apparatus for reproducing information from a disk-shaped information recording medium,
A DVD (Digital Versatile Disc) on which a recording layer conforming to the BD (Blu-ray Disc) standard on which encrypted or scrambled information is recorded and decode information for restoring the encrypted or scrambled information is recorded A reading means for reading each information from a disc-shaped information recording medium having a recording layer compliant with the standard or a recording layer compliant with the CD (Compact Disc) standard;
Decoding information storage means for temporarily storing the decoding information read from a recording layer compliant with the DVD (Digital Versatile Disc) standard or a recording layer compliant with the CD standard;
Restoring means for restoring the encrypted or scrambled information read from the recording layer compliant with the BD (Blu-ray Disc) standard using the decode information supplied from the decode information storage means;
The BD of the same disc-shaped information recording medium is read after the decoding information is read from the recording layer compliant with the DVD (Digital Versatile Disc) standard of the disc-shaped information recording medium or the recording layer compliant with the CD standard. (Blu-ray Disc) control means for controlling the reading means so as to read the encrypted or scrambled information from a recording layer compliant with the standard;
A playback apparatus characterized by comprising:

  The present invention provides an illegal reproduction of main information obtained by illegally copying main information such as digital AV content information recorded on an original disc-shaped information recording medium (regular read-only disc) with respect to a conventional reproduction apparatus. Therefore, it is possible to provide a playback apparatus that can prevent the unauthorized copying of the main information more effectively and prevent the unauthorized reproduction of the illegally copied main information.

  Furthermore, the present invention provides main information and decode information on different recording layers of the same disk-shaped information recording medium, unless a recordable disk-shaped information recording medium having the same multilayer structure as the original disk-shaped information recording medium is supplied. Thus, it is possible to provide a reproducing apparatus capable of reproducing a disk-shaped information recording medium that can prevent the complete copying of each, and as a result, more effectively prevent illegal copying of main information.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
A multi-layer disk-shaped information recording medium reproduced by an embodiment of the reproducing apparatus of the present invention will be described. The recording layer in which main information such as digital AV content is recorded is different from the recording layer in which decoding information necessary for normal reproduction of the main information is different. Various combinations are possible, and here, two disk-shaped information recording media corresponding to two typical reproducing apparatuses will be introduced. In the disc-shaped information recording medium reproduced in the first embodiment, the main information recording layer is a DVD layer (recording layer compliant with the DVD (Digital Versatile Disc) standard), and the decoding information recording layer is a CD layer (CD (Compact Disc)). The recording layer conforms to the standard)). In the disc-shaped information recording medium reproduced in the second embodiment, the main information recording layer is a BD layer (recording layer conforming to the BD (Blu-ray Disc) standard), and the decoding information recording layer is a DVD layer. It is a feature.

  FIG. 1 shows a cross section of a disk-shaped information recording medium (multilayer disc) reproduced in the first embodiment. Main information is recorded on a DVD layer, and decoded information is recorded on a CD layer. In FIG. 1, the multi-layer disc 1 is formed by bonding two plates having a thickness of about 0.6 mm, and the total thickness is about 1.2 mm. The DVD layer is located almost in the middle of the multilayer disk 1 and has a depth of about 0.6 mm in the DVD standard as viewed from the signal reading direction. The CD layer 3 is located on one side of the multilayer disk 1 and has a depth of about 1.2 mm in the CD standard as viewed from the signal reading direction.

  In such a disk-shaped information recording medium having a multi-layer structure, main information such as digital AV content is recorded on the DVD layer 2, and information necessary for normal reproduction of the main information, such as file management information, Decode information such as navigation information is recorded in the CD layer 3 in advance.

  As described above, the main information can be easily illegally copied to a DVD recording medium such as a DVD-R. However, since there is no recording medium having a recordable CD layer in the current DVD recording medium, the decoding information necessary for normal reproduction of main information is stored in different recording layers of the same recording medium as the main information. Cannot be copied to. In other words, since the main information cannot be normally reproduced from a DVD recording medium such as DVD-R in which only the main information is illegally copied, the copy disk is completely meaningless, and consequently, illegal copying is prevented. it can.

  Even if the decode information is illegally copied to the CD-R, the conventional DVD player cannot obtain the main information unless the decode information of the main information is obtained from the same recording medium as the main information. Cannot play normally. Therefore, a CD-R in which only decoded information is illegally copied becomes a meaningless copy disk, and the disc-shaped information recording medium (multilayer disk) reproduced by this embodiment reproduces illegally copied main information illegally. Therefore, it is possible to prevent more powerfully than the conventional reproducing apparatus.

  Furthermore, in the disc-shaped information recording medium having a multi-layer structure reproduced according to the first embodiment, it is necessary to record the main information encrypted or scrambled on the DVD layer 2 and return the main information to the original state. If decoding information related to a key or a key type is recorded on the CD layer 3, a more powerful information recording medium corresponding to prevention of unauthorized copying can be provided.

By the way, since the reproduction of the CD layer 3 is performed by the laser beam that has passed through the DVD layer 2, the DVD layer 2 is a film having wavelength (780 nm of CD standard) selectivity.
Next, a reproducing apparatus of Example 1 for reproducing a disk-shaped information recording medium (multilayer disc) will be described with reference to FIG. When the multi-layer disc 1 is inserted, the playback PU (pickup) unit 32 first reads the decode information recorded on the CD layer 3 of the disc 1 in accordance with an instruction from the control microcomputer 31. The output of the reproduction PU unit 32 is sent to the CD decoder 34 through the RF amplifier 33. In accordance with an instruction from the control microcomputer 31, the CD decoder 34 reads the decoding information related to the key or key type necessary for returning the main information to the original state, and stores it in the internal memory.

  Next, the control microcomputer 31 instructs the playback PU unit 32 and the DVD decoder 35 to read the encrypted or scrambled main information recorded on the DVD layer 2. The DVD decoder 35 restores the encrypted or scrambled main information to the original normal information using the already read decode information, and outputs AV information 35a.

  When an illegally copied disc, such as a DVD-R, is inserted here, the CD layer 3 does not exist, so that the main information cannot be reproduced normally. You will recognize that it is a meaningless act. In addition, when a CD-R in which the decoded information is illegally copied is inserted, since the DVD-layer does not exist in the CD-R, the main information cannot be obtained from the CD-R. Can not. Therefore, the user simply recognizes that a CD-R in which only decoded information is illegally copied is also a meaningless copy disk.

As described above, the reproducing apparatus can more effectively prevent unauthorized copying of main information (more effectively prevent unauthorized reproduction of illegally copied main information).
By the way, a conventional DVD player already supports the reading of CD layers such as CD-ROM and CD-R, which are different standards by DVD players. Therefore, in this reproducing apparatus, the configuration for reading signals from the DVD layer and the CD layer in the multi-layer disc can be realized with almost no cost factor.

  FIG. 2 shows a cross section of the disc-shaped information recording medium (multilayer disc) reproduced in the second embodiment. Main information is decoded into a BD layer (recording layer conforming to the BD (Blu-ray Disc) standard). Information is recorded on each DVD layer. In FIG. 2, the multilayer disk 4 has a plate and a sheet of about 0.6 mm thickness, 0.5 mm thickness, and 0.1 mm thickness bonded together, and the total thickness is about 1.2 mm. The BD layer 5 is located on the signal reading surface side of the multilayer disk 4 and has a depth of about 0.1 mm in the BD standard as seen from the signal reading direction. The DVD layer 6 is located almost in the middle of the multilayer disk 4 and has a depth of about 0.6 mm in the DVD standard as viewed from the signal reading direction.

  In such a disk-shaped information recording medium having a multi-layer structure, main information is recorded on the BD layer 5, and decoding information necessary for normal reproduction of the main information is recorded on the DVD layer 6. As described above, the main information can be easily illegally copied to a BD recording medium such as a BD-R. However, since there is no recording medium having a recordable DVD layer in the current BD recording medium, the decoding information necessary for normal reproduction of main information is stored in different recording layers of the same recording medium as the main information. Cannot be copied to. In other words, since the main information cannot be reproduced normally from a BD-R or other BD recording medium in which only the main information is illegally copied, the copy disk is completely meaningless, resulting in powerful prevention of illegal copying. Can be realized.

  Even if the decode information is illegally copied to the DVD-R, the conventional BD player cannot obtain the main information unless the decode information of the main information is obtained from the same recording medium as the main information. Cannot play normally. Therefore, a DVD-R in which only the decoded information is illegally copied becomes a meaningless copy disk, and the disc-shaped information recording medium (multilayer disk) reproduced according to this embodiment reproduces illegally copied main information illegally. Therefore, it is possible to prevent more powerfully than the conventional reproducing apparatus.

  Further, in the disc-shaped information recording medium having a multi-layer structure reproduced according to the second embodiment, the BD layer 5 is recorded with the encrypted or scrambled main information, and is necessary for returning the main information to the original state. If the decoding information related to the key or key type is recorded on the DVD layer 6, an information recording medium corresponding to stronger illegal copy prevention can be provided.

By the way, since the reproduction of the DVD layer 6 is performed by the laser beam that has passed through the BD layer 5, the BD layer 5 is a film having wavelength (650 nm of DVD standard) selectivity.
Next, a reproducing apparatus of Example 2 for reproducing a disk-shaped information recording medium (multilayer disc 4) will be described with reference to FIG. When the multi-layer disc 4 is inserted, the reproduction PU (pickup) unit 42 first reads the decode information recorded on the DVD layer 6 of the disc 4 in accordance with an instruction from the control microcomputer 41. The output of the reproduction PU unit 42 is sent to the DVD decoder 44 through the RF amplifier 43. In accordance with an instruction from the control microcomputer 41, the DVD decoder 44 reads the decode information related to the key or key type necessary for returning the main information to the original state, and stores it in the internal memory.

  Next, the control microcomputer 41 instructs the playback PU unit 42 and the DVD decoder 45 to read the encrypted or scrambled main information recorded on the BD layer 5. The BD decoder 45 restores the main information that has been encrypted or scrambled to the original normal information while using the decoded information that has already been read, and outputs AV information 45a.

  If an illegally copied disc, such as a BD-R, is inserted here, the DVD layer 6 does not exist, so that the main information cannot be reproduced normally. You will recognize that it is a meaningless act. In addition, when a DVD-R in which the decoded information is illegally copied is inserted, the main information cannot be obtained from the DVD-R because the DVD-R has no BD layer. Can not. Therefore, the user simply recognizes that a DVD-R in which only decoded information is illegally copied is also a meaningless copy disk.

As described above, the reproducing apparatus can more effectively prevent unauthorized copying of main information (more effectively prevent unauthorized reproduction of illegally copied main information).
Incidentally, in the disc-shaped information recording medium reproduced according to the second embodiment, the decoding information related to the key or key type necessary for returning the main information to the original state is recorded on the DVD layer. Since the decoding information is usually a small amount of data, it can be recorded on the CD layer. Furthermore, it is clear that a stronger prevention effect can be achieved by using two layers, a DVD layer and a CD layer.

It is a block diagram which shows the disk shaped information recording medium reproduced | regenerated by Example 1 of the reproducing | regenerating apparatus of this invention. It is a block diagram which shows the disk shaped information recording medium reproduced | regenerated by Example 2 of the reproducing | regenerating apparatus of this invention. It is a block diagram which shows Example 1 of the reproducing | regenerating apparatus of this invention. It is a block diagram which shows Example 2 of the reproducing | regenerating apparatus of this invention.

Explanation of symbols

1 Multilayer Disc 2 DVD Layer 3 CD Layer 4 Multilayer Disc 5 BD Layer 6 DVD Layer

Claims (2)

In a reproducing apparatus for reproducing information from a disk-shaped information recording medium,
CD (Compact Disc) standard recording a recording layer compliant with the DVD (Digital Versatile Disc) standard on which encrypted or scrambled information is recorded, and decoding information for restoring the encrypted or scrambled information Reading means for reading each information from a disk-shaped information recording medium having a recording layer compliant with
Decode information storage means for temporarily storing the decode information read from the recording layer compliant with the CD standard;
Restoring means for restoring the encrypted or scrambled information read from the recording layer compliant with the DVD standard using the decode information supplied from the decode information storage means;
The information encoded or scrambled from the recording layer compliant with the DVD standard of the same disk-shaped information recording medium after the decoding information is read from the recording layer compliant with the CD standard of the disk-shaped information recording medium Control means for controlling the reading means so as to read
A playback apparatus characterized by comprising: In a reproducing apparatus for reproducing information from a disk-shaped information recording medium,
A DVD (Digital Versatile Disc) on which a recording layer conforming to the BD (Blu-ray Disc) standard on which encrypted or scrambled information is recorded and decode information for restoring the encrypted or scrambled information is recorded A reading means for reading each information from a disc-shaped information recording medium having a recording layer compliant with the standard or a recording layer compliant with the CD (Compact Disc) standard;
Decoding information storage means for temporarily storing the decoding information read from a recording layer compliant with the DVD (Digital Versatile Disc) standard or a recording layer compliant with the CD standard;
Restoring means for restoring the encrypted or scrambled information read from the recording layer compliant with the BD (Blu-ray Disc) standard using the decode information supplied from the decode information storage means;
The BD of the same disc-shaped information recording medium is read after the decoding information is read from the recording layer compliant with the DVD (Digital Versatile Disc) standard of the disc-shaped information recording medium or the recording layer compliant with the CD standard. (Blu-ray Disc) control means for controlling the reading means so as to read the encrypted or scrambled information from a recording layer compliant with the standard;
A playback apparatus characterized by comprising:

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