JP2001155421A - Recording device and method, reproducing device and method and recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To permit reproduction of contents only when a formal recording medium and a formal reproducing device are used. SOLUTION: This device records data on the recording medium in a sector unit, and is provided with a enciphering means 1B for enciphering the sector address of the data and a recording means 5 for recording the sector address enciphered by the enciphering means 1B on the recording medium 6 together with the data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording apparatus, a recording method, a reproducing apparatus, a reproducing method, and a recording medium which can prevent reproduction of a recording medium copied illegally.

[0002]

2. Description of the Related Art In recent years, CD-ROMs and DVDs (Digital
The spread of large-capacity recording media such as Versatile Discs has made it possible to process large amounts of music data and image data. Along with this, from the viewpoint of copyright protection, C
Security measures for preventing copying of original data recorded on a D-ROM or a DVD have been regarded as important.

[0003] One method of preventing such illegal copying is a CSS (Content Scramble) used in DVDs.
System). This CSS method is N
IKKEI ELECTRONICS 1997.8.
As described in No. 18, when encrypting content data recorded on a DVD, the content data is encrypted by selecting one of several types of title keys, and this title key is transferred to a plurality of discs. One of the keys is selected and encrypted. Then, the encrypted title key is stored in a sector header area on the DVD disk, which is a recording medium, which cannot be accessed by the user.

[0004] The above-described disk key is encrypted using a master key and converted into an encrypted disk key set. This encrypted disk key set is also stored in a lead-in area on the disk that cannot be accessed by the user. The master key is stored in the DVD playback device.

[0005] When a DVD disc on which such encrypted content data is recorded is reproduced by a DVD reproducing apparatus, as a prerequisite, a master key must be secretly embedded in a regular DVD reproducing apparatus. . First, the encrypted disk key set on the DVD disk is read from the DVD, and decrypted using the master key built in the DVD playback device to obtain a disk key. Next, DVD
The encrypted title key on the disc is decrypted with the above-mentioned disc key, and a title key is obtained. Further, the encrypted content data recorded on the DVD disk is decrypted with the above-mentioned title key, and a disk with an incorrect title key cannot be reproduced by an authorized DVD reproducing apparatus. A DVD disc cannot be reproduced by an illegally manufactured DVD reproducing apparatus that is not embedded.

[0006]

SUMMARY OF THE INVENTION As in the CSS system,
A recording medium on which data is recorded by an encryption method such as embedding some encryption key code for decrypting the encrypted data in the user data, the encrypted data will be output outside the playback device, for example, By decrypting the data on the interface and the data imported to the personal computer, the original data and the encryption key code can be decrypted, and an unauthorized recording medium can be manufactured based on the decrypted content data. This unauthorized recording medium could be reproduced by the reproducing device.

[0007] Therefore, there has been a demand for a method of making it more difficult to decrypt the encrypted data and preventing reproduction of an unauthorized recording medium. In view of the above, the present invention provides a recording / reproducing apparatus for adding and recording sector information to main information constituting content data such as images and sounds, and recording and reproducing the sector address. It is an object of the present invention to make a recording medium manufactured illegally unreproducible by performing a reproducing operation while decoding the sector address obtained.

[0008]

According to another aspect of the present invention, there is provided a recording apparatus for recording data on a recording medium in a sector unit, comprising: a sector address generating means for generating a sector address of the data; A recording apparatus comprising: an encryption unit for encrypting a sector address; and a recording unit for recording the sector address encrypted by the encryption unit together with the data on the recording medium. I do.

A recording method for recording data on a recording medium in sector units, comprising: an address generation step for generating a sector address of the data; an encryption step for encrypting the sector address; Recording the sector address together with the data on a recording medium.

Further, there is provided a reproducing apparatus for reproducing data recorded on the recording medium 6 by the above-mentioned recording apparatus, wherein the sector address detecting means 1 detects the sector address.
5 and an encryption / non-encryption information detecting means 14 for detecting encryption / non-encryption information indicating whether or not the sector address is encrypted.
Decrypting means 23B for decrypting the encrypted sector address when it is detected by the encryption presence / absence information detecting means 14 that the sector address is encrypted.
And reading data in accordance with the decoded sector address.

[0011] Furthermore, there is provided a reproducing method for reproducing data recorded on a recording medium by the above recording method,
A sector address detection step of detecting the sector address; an encryption presence / absence information detection step of detecting encryption presence / absence information indicating whether the sector address is encrypted; and the sector address being encrypted by the encryption detection step. A decryption step of decrypting the encrypted sector address when it is detected that the data is read, and reading data according to the decrypted sector address.

Further, the present invention provides a recording medium 6 for recording data in sector units, wherein the sector address of the data is encrypted and recorded together with the data.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A recording apparatus, a recording method, a reproducing apparatus, a reproducing method, and a recording medium for preventing reproduction of an unauthorized recording medium according to the present invention will be described with reference to the drawings.
FIG. 1 shows a recording format of a recording medium according to the present invention, FIG. 2 shows a recording block diagram, FIG. 3 shows a reproduction block diagram, and FIG. 4 shows a region arrangement of the recording medium.

In FIG. 1, one sector is composed of a plurality of frames, and a sync code for synchronizing data during reproduction is inserted at the head of each frame. In the first frame of one sector, a sector address is recorded after the above-mentioned sync code, and between the sync code and the sector address, it is determined whether or not the sector address of this sector has been subjected to encryption processing. Encryption flag information, which is a flag, is recorded. Further, the encryption presence / absence information and the sector address include the error detection parity C
RC (Cyclic Redundancy Code) is added,
Data is recorded in the subsequent data area. Here, although not shown, an error correction parity added to the main data and the like is added to the data area, and a lead in
In the data area of the area, an encryption key code for decryption is recorded. In the second and subsequent frames, a sync code and data are recorded.

Next, a recording apparatus and a recording method according to the present invention will be described with reference to FIG. The encryption method in the present embodiment uses the CSS method as in the conventional example. The first encryption key data (title key in the conventional example) is key data determined by an organization that manages encryption, and the second encryption key data (disk key in the conventional example) is freely available to the copyright holder (user). Is data that can be set to The second key data is encrypted by the first encryption unit 1A using the first encryption key data.

On the other hand, the first CRC adding means 3A calculates and adds a CRC to the sector address of the lead in area and the encryption presence / absence information. In this case, there is no encryption presence / absence information. The second key data encrypted by the first encrypting means 1A is the first E data as an encryption key code.
It is input to the CC encoding means 2A and ECC encoded. ECC encoded encryption key data is CRC
First using the added lead inarea sector address
A sector is constituted by the sector constructing means 4A, and a sync code is added and modulated by the sync code adding and modulating means 5 so that the lead in ar
Recorded in ea.

The main data (image, sound, etc.) recorded in the program area is stored in the second ECC encoder 2B.
Is ECC encoded. On the other hand, program are
The sector address of a is set to the second using the second encryption key data.
Is encrypted by the encryption means 1B. Then, the CRC is calculated and added to the encrypted sector address by the second CRC adding means 3B using the encryption presence / absence information.
The encryption presence / absence information in this case is valid. The ECC-encoded main data forms a sector by means of the second sector structuring means 4B using the sector address of the program area to which the CRC is added, and a sync code is added and modulated by the sync code adding and modulating means 5. This is recorded in the program area on the disk 6.

Next, a reproducing apparatus and a reproducing method according to the present invention will be described with reference to FIG. Note that the encryption method in the present embodiment uses the same method as the conventional CSS method.

When the power of the reproducing apparatus according to the present embodiment is turned on, the CPU 20 reads radius information from the disk mechanism system, and reads a read pickup head (hereinafter, referred to as PUH) on the disk 6 based on the radius information. The user moves to the in area and starts reading information from the disk 6. The signal read from the PUH is not shown, but after being subjected to an amplifier, waveform equalization, and the like, a sync code is detected by the sync code detecting means 11,
Apply synchronization. The data following the sync code is the demodulation means 1
2, after demodulation by the ECC error correction means 13,
Encryption presence / absence information detecting means 14, sector address detecting means 1
5 respectively. The encryption / non-encryption information detecting means 14 confirms that it is a lead in area, and sets the sector address detected by the sector address detecting means 15 to C
The switch 18 is connected to the non-cryptographic position to send to the PU 20. When the sector address is the sector in which the encryption key code is written, the CPU 20 closes the switch 19 and
The data corrected by the ECC error by the CC error correction unit 13 is sent to the decryption encryption key code detection unit 21. After detecting the encryption key code, the decryption encryption key code detection means 21 stores the encryption key code in the memory 22. The encryption key code stored in the memory 22 is
When the above program area is reproduced, it is decrypted by the first decryption means 23A using the first encryption key data,
Obtain second encryption key data. Note that the encryption presence / absence information detecting means 14 is used because it is difficult to determine the presence / absence of encryption at the boundary between the lead in area and the program area when the radial position information is not accurate during reproduction of the disc.

Next, the operation at the time of reproducing the program area will be described. The PUH is moved to the program area on the disk 6 based on the radius information from the disk mechanism system and the reading of the information is started. The sector address detected by the sector address detecting means 15 is decrypted by the second decrypting means 23B using the second encryption key data. The decrypted sector address is sent to the CPU 20 by connecting the switch 18 to the encryption-enabled side after confirming in advance that the encryption is enabled by the encryption presence / absence information detecting means. CPU2
When an error is detected by 0, the reliability of the obtained sector address can be determined, and the CPU 20 can perform processing such as predicting the sector address where the error is detected from the preceding and following sector addresses. In addition, since the presence or absence of encryption can be determined before reading the sector address by arranging the encryption presence / absence information between the sync code and the sector address, the subsequent sector address can be immediately decrypted.

The seek operation and the like are controlled by the CPU 20 based on the sector address obtained by the above processing, and the main data is read and output. In this embodiment,
If the encryption key code cannot be detected, the program area
Since the sector address of the
U20 cannot move to the desired sector,
m area data cannot be read. Therefore,
Since information cannot be reproduced unless a proper disc and a proper reproduction device are used, reproduction of an unauthorized recording medium can be prevented. Further, since it is not necessary to put the encryption key code and the sector address on the interface on the playback device, it becomes very difficult for a general user to illegally decrypt the encryption of the sector address itself.

Next, the area arrangement of the disk 6 used in this embodiment will be described with reference to FIG. In the figure,
The section up to the radius a is a clamping area for fixing the disk 6 to a spindle motor (not shown), and the section from the radius a to the radius b is a leadin area for recording control information other than data actually used by the user. It is.
The section from the radius b to the radius c is an area for recording actual data in the program area. outside radius c of program area
There is a lead out area in the section of radius d from
Indicates the end of the am area.

As described above, in the above-described embodiment, a scheme similar to the CSS scheme is used as the encryption scheme. However, the present invention is not limited to this scheme. Is stored in the lead in area, but there is no problem as long as it is within a sector having a predetermined non-encrypted sector address. Further, in the present embodiment, all the sector addresses of the lead in area are not encrypted, and all the sector addresses of the program area are encrypted, but encrypted sectors and unencrypted sectors are mixed. May be. Further, in the present embodiment, description has been made by taking an optical disc as an example, but any recording apparatus, recording method,
The present invention is applicable to a reproducing apparatus, a reproducing method, and a recording medium.

[0024]

As described above in detail, according to the recording apparatus, the recording method, the reproducing apparatus, the reproducing method and the recording medium of the present invention, by encrypting the sector address, the encryption key code of the sector address can be changed. If it cannot be detected, the sector address remains encrypted, so that it is not possible to move to the desired sector and data cannot be read. Therefore, there is an effect that the content cannot be reproduced unless a proper disc and a proper reproduction device are used. Further, since it is not necessary to put the encryption key code and the sector address on the interface on the reproducing apparatus, it is very difficult for a general user to illegally decrypt the encryption of the sector address itself.

[Brief description of the drawings]

FIG. 1 is a diagram showing a recording format of a recording medium according to the present invention.

FIG. 2 is a block diagram showing a recording apparatus according to the present invention.

FIG. 3 is a block diagram showing a playback device according to the present invention.

FIG. 4 is a diagram showing an area arrangement of a recording medium according to the present invention.

[Explanation of symbols]

 1A First encryption means 1B Second encryption means 2A First ECC encoding means 2B Second ECC encoding means 3A First CRC addition means 3B Second CRC addition means 4A First sector configuration means 4B Second sector configuration means 5 Sync code addition and modulation means 6 Disk 11 Sync detection means 12 Demodulation means 13 ECC error correction means 14 Encryption presence / absence information detection means 15 Sector address detection means 16 Error detection means by CRC 17 Thread motor control means 18 , 19 switch 20 CPU 21 decryption encryption key code detection means 22 memory 23A first decryption means 23B second decryption means

Claims (5)

[Claims] 1. A recording apparatus for recording data on a recording medium in sector units, a sector address generating means for generating a sector address of the data, an encrypting means for encrypting the sector address, and the encrypting apparatus. Recording means for recording the sector address encrypted by the means together with the data on the recording medium. 2. A recording method for recording data on a recording medium in sector units, comprising: an address generating step for generating a sector address of the data; an encrypting step for encrypting the sector address; Recording the sector address together with the data on a recording medium. 3. A reproducing apparatus for reproducing data recorded on a recording medium by the recording apparatus according to claim 1, wherein: a sector address detecting means for detecting the sector address; and whether the sector address is encrypted. Encryption presence / absence information detection means for detecting encryption presence / absence information indicating whether the sector address is encrypted, and decrypting the encrypted sector address when the encryption presence / absence information detection means detects that the sector address is encrypted. A reproducing apparatus, comprising: decoding means; and reading data according to the decoded sector address. 4. A reproducing method for reproducing data recorded on a recording medium by the recording method according to claim 2, wherein: a sector address detecting step of detecting the sector address; and whether the sector address is encrypted. An encryption / non-encryption information detection step of detecting whether or not the sector address is encrypted, and a decryption step of decrypting the encrypted sector address when the encryption / decryption step detects that the sector address is encrypted. Reading data according to the decoded sector address. 5. A recording medium for recording data in sector units, wherein the sector address of the data is encrypted and recorded together with the data.