JP2003228909A - Optical disk recording and reproducing system, drive unit, recording and reproducing method, and optical disk - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the concealment and alteration of information of a disk when the recorded disk is taken out without permission in a rewritable optical disk recording and reproducing system. <P>SOLUTION: The optical disk recording and reproducing system which encrypts the disk identification code of a recording area out of a user area of the disk by a protection command from a host to the recorded disk and releases the encryption by a protection release command is provided. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing system for concealing information recorded on an optical disc and preventing rewriting, and more particularly to a recording / reproducing protection technique for protecting recording / reproduction of information recorded on an optical disc medium. Regarding the system.

[0002]

2. Description of the Related Art As a rewritable optical disk medium,
For example, a CD-RW for a CD and a DVD-RAM or a DVD-RW for a DVD are on the market as large-capacity recording media, and they are about to be used for various purposes in the future. The optical disc, which is a rewritable medium, can be used not only for the movement of data between a plurality of PCs but also for the exchange of data with an AV product such as a disc player or a recorder, taking advantage of its portability. It is about to be done.

In the transfer of information in such a large-capacity optical disk recording / reproducing system, the CPPM in a reproduction-only disk for copy protection for copyright protection is used.
(Content Protection for P
CPRM (Content Protect) for re-recorded media and recordable discs
section for Recordable Medi
Content protection systems such as a) have been adopted, and in a disc to which this function is added, even if the information on the disc is copied, it is impossible to reproduce the same as the master.

For example, D which is one of rewritable media
In the VD-R disc, data information such as video and audio is stored in CSS (Contents Scramble).
A system for encrypting main data with content-specific identification information called gSystem) is adopted, and the data is encrypted and recorded in the main information area.

On the other hand, the physical format information including the key information for deciphering the main information area and the disc manufacturing information are recorded in the control data area in the lead-in area on the inner peripheral side of the DVD-R, To reproduce a DVD disc, the optical pickup is moved to a portion on the inner peripheral side of the DVD disc based on an instruction from the system control circuit and read by the optical pickup. If the read signal is the key information in the control data area, it is amplified by the front-end processor, then digitized and demodulated and sent to the system control circuit. If it is not the key information, the optical pickup is moved further to the inner circumference of the DVD disc. Move to the part on the side of the unit and search for the key information of the DVD disc. By repeating such an operation, the key information recorded in the control data area located on the inner peripheral side of the DVD disc is searched for.

When the key information is detected, the system control circuit moves the optical pickup to a portion on the outer peripheral side of the DVD disc, and the optical pickup reads the data information recorded in the main information area of the DVD disc. .

Since this data information is encrypted,
The key information recorded in the previously read control data area is used to decrypt the data information in the main information area and reconstruct the original normal video and audio data. For copy protection, the encrypted main information area can be copied, but the key information in the control data area cannot be copied, so that the same disk cannot be copied.

Further, in Japanese Patent Laid-Open No. 11-213538, based on a predetermined setting instruction, the management information of the storage medium recorded in a predetermined area in a predetermined format of the storage medium is converted into another format or converted into another area. Has a write control means for changing,
Furthermore, when the first identification symbol recorded in the storage medium corresponds to the second identification symbol which is the identification symbol of the information storage device in which the storage medium is mounted, the management information converted into another format is predetermined. It is shown that a read control means for restoring the format or reading the management information from another area is provided.

[0009]

However, in a disc adopting such a copy protection system, although copying of the content recorded on the disc can be invalidated, if the disc itself is stolen, the disc cannot be copied. The information was accessible as it was and the information could be obtained.

That is, CSS (Content Scra)
A copy protection system such as the Mble System) cannot be said to be an effective system for the confidentiality of the information itself. For example, if important record data created by itself is taken out without permission, the data is read-only. Even if it is copy protected like the DVD of
There was a situation where the information was stolen as it was or was tampered with maliciously.

This is not limited to a DVD-R, but can be a CD-R / RW, a DVD-RW or a DVD that can be additionally written or rewritten.
-In the same state as in the RAM medium, as the demand for rewritable removable media grows, not only the copy protection of the disc but also the acquisition of the information of the disc itself or the prevention of the rewriting of the disc information protection system which realizes the rewrite prevention is realized. The need is growing.

As a data recording method for prohibiting such unauthorized disk copying and information leakage, for example, Japanese Patent Laid-Open No. 2001-195827 discloses, when digital data is recorded on an optical disk, each time the digital data is recorded. Independent recording identification information is generated, the input data is encrypted using the generated recording identification information, and this recording identification information is encrypted using the recording medium identification information unique to the optical disc, and is recorded on the optical disc. As a result, as long as this record identification information is unknown, the data is not valid and copy suppression is possible.

However, in the data recording / reproduction according to this conventional technique, it is necessary to encrypt the record data with the record identification information every time the data is recorded on the disc, and to decrypt the encrypted data with the record identification information every time the data is reproduced from the disc. Yes, it takes a lot of time to perform the procedure and processing required for this encryption processing and decryption processing, and to realize the encryption processing and the decryption processing in parallel with the data recording / reproducing without lowering the data transfer rate. It has a drawback that it requires a high-speed circuit section.

Further, in the technique described in Japanese Patent Laid-Open No. 11-213548, the format of the management information of the recording medium is changed to protect the information, and the identification code corresponding to the change of the format of the management information is stored in the storage medium. In this case, the access to the user area of the recording medium is enabled only when the identification code and the identification code of the storage device match at the time of loading the disc, and the security cannot be said to be sufficient. . If the identification codes do not match, loading is disabled and access to the recording medium is prohibited.
Although the recording medium itself cannot be used, access to confidential information recorded on the recording medium should be prohibited and the storage medium itself should be usable.

The object of the present invention is to solve the above-mentioned problems. Not only is the copy guard applied, but the information is kept secret by making it impossible to acquire the information. Another object of the present invention is to provide a recording / reproducing technique capable of preventing data tampering even if the data is illegally taken out by someone. Another object of the present invention is to provide an optical disk recording / reproducing technique which does not require a high-speed circuit unit for encryption processing or decryption processing when recording / reproducing data on / from a disk having a data transfer rate restriction.

[0016]

In order to achieve the object of the present invention, in the first invention, the optical disk recording / reproducing system has a rewritable area other than the user use area of the disk, and other than the user use area. An optical disc having an identification code area for defining the disc format presence / absence in the rewritable area, an optical disc drive device for recording / reproducing the optical disc with an optical pickup, and a host computer for controlling the optical disc and the optical disc drive device. An information protection and cancellation processing unit is provided in the optical disk drive apparatus, and the information protection and cancellation processing unit performs protection in the identification code area of the optical disk based on a protection command having protection identification information issued by the host computer. The identification information is written and recorded on the optical disk, or the host The protection identification information of the protection release command and the identification code of the optical disc inserted in the optical disc drive device are stored in the information protection and release processing unit based on the protection release command having the protection identification information issued by the computer. Then, a match determination is performed, and only when they match, the identification code is rewritten to a formatted code and recorded on the optical disc by the optical pickup.

In the second invention, the optical disk recording / reproducing system has a rewritable area other than the user use area of the disk, and the rewritable area other than the user use area defines an identification code area and a reserve. An optical disc having an area, an optical disc drive device for recording / reproducing on / from the optical disc by an optical pickup, and a host computer for controlling the optical disc and the optical disc drive device are provided, and an information protection and cancellation processing unit is provided in the optical disc drive device. Based on a protection command having a password issued by the host computer, the information protection and cancellation processing unit writes the protection identification information in the identification code area and the password in the reserve area and records the information on the optical disc. , Or the host computer Based on the protection release command having the password to be issued, the password of the protection release command and the password written in the reserve area of the optical disc mounted in the optical disc drive device are stored in the information protection and release processing unit and matched. Only when they are discriminated, the code of the identification code recorded in the identification code area is rewritten to the formatted code and recorded on the optical disc by the optical pickup.

In a third aspect based on the second aspect, the optical disc drive apparatus is provided with an encryption and decryption processing circuit, and the information protection and release processing is performed based on a protection command issued by the host computer having a password. Section writes the protection identification information in the identification code and the password in the reserve area, the encryption and decryption processing circuit performs the encryption processing of the rewritable area of the optical disc, and the optical pickup records it on the optical disc. Alternatively, based on a protection release command having a password issued by the host computer, the password of the protection release command and the password recorded in the reserve area of the optical disc mounted in the optical disc drive apparatus are used for information protection and It is stored in the cancellation processing unit and a match determination is performed. Only rewrite the identification code in the sign of the formatted case of performs decoding processing of the encrypted information of the optical disc rewritable area in cryptographic-decoding processing circuit, and records on the optical disk by the optical pickup.

In the fourth invention, the optical disk recording / reproducing system has a rewritable area other than the user use area of the disk, and an identification code area for defining the presence or absence of the disk format in the rewritable area other than the user use area. Optical disk, an optical disk drive device for recording / reproducing on / from the optical disk, a host computer for controlling the optical disk and the optical disk drive device, and the information protection and cancellation processing unit and the optical disk drive specific information are stored in the optical disk drive device. A drive unique information recording unit is provided, and protection identification information having the optical disc drive unique information as key information in the identification code area of the disc in the information protection and cancellation processing unit based on a protection command issued by the host computer. And write it on the optical disc, Alternatively, based on a protection release command issued by the host computer, an information protection identification code having the optical disc drive unique information of the drive unique information recording unit as key information and an identification code of the optical disc mounted in the optical disc drive device. Is stored in the information protection and cancellation processing section to determine whether or not there is a match. Only when they match, the identification code is rewritten to a formatted code and recorded on the optical disc by an optical pickup.

According to the fifth aspect of the invention, the optical disc drive device controls the information protection and cancellation processing section based on the optical pickup, the information protection and cancellation processing section, and the protection command issued by the host computer having the protection identification information. Means for recording the protection identification information in the identification code area of the optical disc, and based on the protection release command having the protection identification information issued by the host computer, the protection identification information of the protection release command and the optical disc The reproduced identification code is stored in the information protection and cancellation processing unit to determine whether they match, and only when they match, the identification code written in the rewritable area of the optical disc is rewritten to a formatted code. The optical pickup records on the optical disc.

According to a sixth aspect of the invention, the optical disk drive device uses an optical pickup, an information protection / cancellation processing unit, and the information protection / cancellation processing unit based on a protection command having a password issued by the host computer. Write protection identification information in the identification code area of the optical disc,
A means for recording the password in the reserved area of the optical disk, storing a protection cancellation command having a password issued by the host computer and the password written in the reserved area of the optical disk in the information protection and cancellation processing section. Matching determination is performed, and only when they match, the code of the identification code recorded in the identification code area of the optical disc is rewritten to a formatted code and recorded on the optical disc by the optical pickup.

According to a seventh invention, in the sixth invention, an encryption / decryption processing circuit is provided, and the encryption / decryption processing circuit performs encryption processing on the rewritable area of the optical disk, and then the optical pickup. In the case where the password of the protection release command and the password recorded in the reserve area of the optical disc match based on the protection release command having the password issued by the host computer, The encryption / decryption processing circuit decrypts the encrypted information in the rewritable area of the optical disc, and the optical pickup records the information on the optical disc.

In the eighth invention, the optical disk drive device is based on an optical pickup, an information protection and cancellation processing section, a unique information recording section for storing unique information of the drive apparatus, and a protection command issued by the host computer. ,
Means for recording protection identification information having the unique information as key information in the identification code area of the optical disc in the information protection and release processing section, and based on a protection release command issued by the host computer, The information protection identification code having the unique information of the unique information recording section as key information and the identification code of the optical disc are stored in the information protection and cancellation processing section to determine the match, and only when they match, the identification code is formatted. And is recorded on the optical disc by an optical pickup.

According to a ninth aspect of the present invention, in the recording / reproducing method, the protection identification information is recorded in the identification code area of the optical disc based on the protection command issued by the host computer and having the password, and the password is stored in the reserve area of the optical disc. The step of recording, the step of determining whether the protection release command having the password issued by the host computer and the password written in the reserve area of the optical disc match, and only if they match, the data is recorded in the identification code area of the optical disc. Rewriting the code of the existing identification code into a formatted code and recording it on the optical disc.

According to a tenth invention, in the ninth invention,
A step of performing an encryption process on the rewritable area of the optical disc and recording it on the optical disc based on a protection command having a password issued by the host computer; a password of the protection release command and the reserved area of the optical disc. Only when the recorded passwords match, the encrypted information in the rewritable area of the optical disc is decrypted and recorded on the optical disc.

According to an eleventh aspect of the invention, the recording / reproducing method comprises a step of recording protection identification information having the unique information of the drive device as key information in the identification code area of the optical disc based on a protection command issued by the host computer. Determining a match between an information protection identification code having the unique information as key information and an identification code of the optical disc, based on a protection release command issued by the host computer,
Only when they match, the identification code is rewritten to a formatted code and recorded on the optical disc.

In the twelfth aspect of the invention, the rewritable optical disc has a user use area and a rewritable area other than the user use area, and the rewritable area other than the user use area is an identification for defining the presence or absence of a disc format. Protection identification information is recorded in the identification code area based on a protection command having a password issued by the host computer, which includes a code area and a reserve area.
The password is recorded in the reserved area, and when the password of the protection cancellation command and the password written in the reserved area match based on the protection cancellation command having the password issued by the host computer, the identification code area The code of the identification code recorded in is rewritten to the formatted code.

According to a thirteenth invention, in the twelfth invention, the rewritable area is encrypted, and the password of the protection cancellation command and the optical disk are based on a protection cancellation command issued by the host computer and having a password. Only when the passwords recorded in the reserve area of No. 1 match, the decrypted information is recorded in the optical disk rewritable area.

In the fourteenth invention, the rewritable optical disc includes a user use area, a rewritable area other than the user use area, and an identification code area for defining the disc format presence / absence in the rewritable area other than the user use area. Based on a protection command issued by the host computer, protection identification information having the unique information of the drive device as key information is recorded in the identification code area, and based on the protection release command issued by the host computer, When the information protection identification code having the unique information as key information and the identification code match, the identification code is rewritten to a formatted code.

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings using some examples. FIG. 1 is a transition diagram showing an example of state transition of an optical disc in an optical disc recording / reproducing system according to the present invention. In FIG. 1, state 1 shows the state of the optical disc before formatting. Format the disk in state 1 to state 2. Therefore, the state 2 is the state of the optical disc after being formatted. State 3 shows the state of the optical disc in which information is recorded by the user, and state 4 shows the state of the optical disc in which the information recorded on the disc in state 3 is protected.

When recording data from the host computer, first, formatting is performed on the disk in the initial state shown in state 1. The formatted disc becomes the state 2 shown in FIG. 1 and becomes recordable and reproducible, and the data transferred together with the recording command from the host computer is recorded in the user data area of the disc. The disc recorded in the user data area is in the state 3 shown in FIG.
Therefore, it becomes possible to reproduce data from the disc by a read command instruction from the host computer. Further, in this state 3, as in the case of state 2, additional writing and rewriting are possible by a recording command from the host computer.

A state 4 in FIG. 1 shows a state in which the disc is protected from being concealed or altered according to the present invention, and the information protection identification code input from the host computer is included in the format information of the lead-in area of the optical disc. By rewriting the DDS identification code to the information protection identification code, when the optical disc is inserted into the drive device again, it is not recognized as a normally formatted disc, and data reproduction and rewriting are impossible.
In order to cancel this, it is necessary to input the information protection identification code again from the host computer and confirm that it matches the information protection identification code stored in the optical disc.

FIG. 2 is a schematic diagram showing a recording state of a DVD-RAM disc. The DVD-RAM disc, which is one of the rewritable optical discs, is
Lead-in area 201, user data area 202,
The lead-out area 203 is divided into three areas.
The lead-in area 201 is divided into a non-rewritable embossed data zone 204 and a rewritable rewritable data zone 205. The embossed data zone 204 stores control data in which a physical format such as a disk shape and medium information is recorded, and is rewritable. In the data zone 205, a defect management area (D
effect Management Area: D afterwards
206 and 207 are present. Also,
The lead-out area 203 also has a rewritable data zone 208 and DMA areas 209 and 210 exist.

In this way, the DMA areas 206, 207,
209 and 210 have a total of four locations, two locations in the lead-in area and two locations in the lead-out area, and the same data are recorded in quadruplicate for defect protection. As shown in FIG. 2, each DMA area has a Primary Defect List of one ECC block unit.
(Hereinafter abbreviated as PDL) 212, 214 and Seconda
ry Defect List (hereinafter abbreviated as SDL) 2
It is divided into 13, 215. Here, the ECC block is an Error Corr for data error correction.
This means a block of 32 KB unit to which an action code is added, which is a data recording unit in DVD, and one ECC block is composed of 16 sectors for every 2 KB.

The PDLs 212 and 214 are primary defect lists, which are registered in sector units at the time of shipment of the disk and certification (writing is performed on the entire surface to find a defect), and the defective sector is slipped. SDL21
Numerals 3 and 215 are secondary defect lists, which are registered in ECC block units during disk recording, and defective ECC blocks in the user data area are alternately allocated to replacement areas allocated at both ends of the user area. The list is registered in SDL.

The format of the optical disc is divided into two types according to the way of dealing with the defective portion of the disc,
The quick format initializes the SDLs 213 and 215 to enable replacement processing of defective portions that occur during recording / reproduction of the disc, and the full format certifies defects in the entire user area and performs primary defect registration in the PDLs 212 and 214. Further, D is placed at the head of the PDL 212, 214.
One sector is allocated to the isc Definition Structure sector (hereinafter abbreviated as DDS sector) 217, and a DDS identification code indicating whether or not the disk has been formatted, start address information for each zone of the disk caused by slipping of the defective sector, and the like are recorded. ing.

In the present embodiment, by rewriting the DDS identification code indicating whether or not it has been formatted into the information protection identification code, it is possible to make it impossible to recognize the disc as a normally formatted disc, and therefore the user data area 202. It is possible to prevent the recording and reproduction of the information. On the other hand, in order to cancel this and return to the disk state 3 shown in FIG. 1, the host needs to issue a protection cancellation command having the same information protection identification code again. In order to repeat protection, issue a protection command again to change to disk status 4, and to cancel it, issue a protection cancellation command to return to disk status 3 to repeat protection and cancellation of the disk. It will be possible.

FIG. 3 is a block diagram showing an embodiment of the optical disk recording / reproducing system according to the present invention. In the figure, 1 is a DVD-RAM disk which is a recordable / reproducible medium, 2 is an optical disk drive device for recording / reproducing information on / from the optical disk 1, and 3 is recording / reproducing information on the optical disk 1 via the drive device 2. It is a host computer that controls instructions. Optical disk drive device 2
2, an optical pickup 21 takes out information recorded on the optical disc 1 by a semiconductor laser and converts it into a reproduction signal, or records data from the host computer 3 on the optical disc 1. Reference numeral 22 is a front-end processor, which distributes the reproduction signal extracted from the optical pickup 21 into a servo signal, a clock signal, and a data signal. Reference numeral 23 denotes a servo control circuit, which controls the focus and tracking of the optical pickup 21 and the rotation of a spindle motor for rotating the disk based on a servo signal.

Reference numeral 24 is a clock reproduction signal processing circuit,
The clock that is the source of the synchronization signal for recording and reproduction is reproduced. A laser control circuit 25 drives the laser by modulating the recorded data that has been encoded.
Reference numeral 26 is a DVD encoder, which converts recording data into DVD-compatible encoded data. Reference numeral 27 is a DVD decoder, which decodes a reproduction data signal to decode recording data. Reference numeral 28 denotes a system processor, which controls each unit of the optical disc drive device 2 by a microprogram to record and reproduce data on the disc 1. Reference numeral 29 is an interface circuit, which is an ATAPI (A
TA Packet Interface), SCSI
(Small Computer System In
interface) or USB (Universal)
The optical disk drive device 2 and an external host computer 3 are connected by an interface standard such as Serial Bus). Reference numeral 30 denotes a protection / cancellation processing unit for the disk 1, which processes and cancels the user information recorded on the disk 1 so that the user information cannot be read and written, and is controlled by the system processor 28.

Next, the reproducing and rewriting operations in the above system will be described. When performing reproduction, when the optical disc 1 is loaded, the pickup 21 moves to the optical disc 1
The front end processor 22 detects the optical signal by irradiating a laser beam onto the optical signal, and the front end processor 22 detects the focus signal, the tracking signal, and the necessary tracking signal from the optical detection signal.
A rotation control signal is generated, and the servo control circuit 23 performs servo control necessary for reproducing data from the disc.

When the servo is applied, the pickup 21
Obtains control information such as the medium standard name (DVD-RAM), disc size, disc structure, recording density, rotation speed, and recording power from the rewritable area of the lead-in area 201 of the optical disc 1. The DDS identification code is detected from the rewritable area of 201, stored in the protection / cancellation processing unit 30 of the drive through the front end processor 22, and the information protection identification code and the DDS identification code input from the host computer 3 are confirmed. To do. If the two codes match, DD
The S identification code is rewritten to a code indicating that it has been formatted, and combined with other DMA data to form data in 1-block units. ECC is added by the DVD encoder 26 and the same process as that for normal recorded data is performed on the disc. DMA
The data is recorded in the areas 206, 207, 209 and 210.

As a result, the disc 1 can reproduce data normally, and the pickup 21 reads the data corresponding to the reproduction address and the number of blocks added to the read command from the user data area 202 of the optical disc, and the front end processor 22. The disc reproduction signal is generated at, and the DVD decoder 27 synchronizes with the clock reproduced by the clock reproduction signal processing unit 24 to perform 1EC.
After correcting the data error in C block units, demodulation,
The reproduction data is transferred to the host computer 3 via the interface unit 29.

On the other hand, also in the case of rewriting, as in the case of reproduction, the information protection identification code inputted from the host computer 3 and the DDS identification code from the optical disc 1 are checked for coincidence, and if the two codes coincide, the DDS identification is carried out. the code,
By rewriting the code to indicate that it has been formatted, it can be rewritten by returning it to a normal formatted disk. That is, in response to a write command from the host computer 3, the recording data is received by the DVD encoder 26 through the interface unit 29, ECC is added to each ECC block unit of the DVD format, and then the data is modulated into the disk recording data to be controlled by the laser control circuit. 25, and the laser control circuit 25 supplies the pickup 21
Is used to irradiate the user data area 202 of the disc with laser light for recording. The recording address and the number of blocks to be recorded in the user data area 202 of the disc are added to the write command from the host, and the system processor controls to record in the area corresponding to this recording address.

In this way, when the information protection identification code sent from the host computer 3 and the DDS identification code received from the optical disc 1 match, the optical disc 1
The recorded information can be rewritten or reproduced, and the recorded information can be obtained. However, if the information protection identification code sent from the host computer 3 and the DDS identification code received from the optical disc do not match, the above reproduction is performed. Alternatively, the rewriting operation is not performed and the information is preserved.

In this embodiment, the host computer 3
The command based on the information protection identification code for concealing the disc information issued by is issued by the user's instruction and can be controlled by the device driver software of the drive 2 installed on the host computer. Yes, there is no need to impose a cost burden.

However, in this embodiment, the information in the user data area 202 is not encrypted, and this information may be read by another means.
A second embodiment will be described in which the DDS identification code of (1) is rewritten to the information protection identification code to make recording / reproduction impossible and the user data can be encrypted. FIG. 4 is a schematic view showing an embodiment of the password recording position of the DVD-RAM disc, and the DDS of the information protection optical disc 1
An area 401 such as a DDS identification code is provided in one sector 217.
In addition to the start address storage area 403 of each zone, a reserve area 404 and an encrypted information area 402 regarding disk reproduction protection are provided. The password issued by the host computer 3 is recorded in the encrypted information area 402 related to the disc reproduction protection.

The host computer 3 issues a protection command having a password, and the protection / cancellation processing unit 30 confirms that the password stored from the DDS1 sector 217 of the optical disk 1 and the password issued by the host computer 3 match, and they match. In this case, the DDS identification code and the reserved area 404 are respectively written with the formatted code and the password, and the optical pickup 21 records the same on the optical disc 1 to enable normal recording and reproduction.

On the other hand, in order to make a normal formatted disk into a protected disk having a password, the protection / cancellation processing unit 30 identifies the DDS on the basis of the protection command issued by the host computer 3 with the password. The code is an information protection identification code using the password as the key information, the password is written in the reserve area 404, combined with other DMA data to form one block unit data, and ECC is added by the DVD encoder 26. It is performed by recording in the DMA area of the optical disk by the same processing as that of normal recording data.

FIG. 5 is a schematic view showing the normal state and encrypted state of the optical disc format, the information protection identification code, and the user data. FIG. 5A shows the state of the disc before formatting, and the state 1 shown in FIG.
Corresponding to. In this state, nothing is recorded on the optical disc, and recording / reproduction cannot be performed on the user data area unless the host computer 3 formats the disc. FIG. 5B shows a state of the disc after the formatting. DDS1 to DD are added to DMA1 to DMA4.
S4 is provided. This corresponds to the state 2 shown in FIG. This state is a state in which formatting has been performed, and it becomes possible to record arbitrary information in the user data area by the recording command for the first time in this state.

FIG. 5C shows a state in which information is recorded in the user data area 202. In this state, additional recording including reproduction of information from the disc and rewriting to the disc becomes possible, and the state shown in FIG. Corresponds to 3.

FIG. 5D shows a state in which the information protection identification code and the password are recorded in the DDS identification code and the reserve area of the DDS1 sector in the DMA area, and the rewriting including data reproduction and additional recording is prohibited. In this state, the host cannot read / write the disk, which corresponds to the state 4 shown in FIG. For this state,
By issuing a protection release command with a password in the host computer and confirming that it matches the password of the optical disc, the information protection identification code of the DDS identification code of the DDS1 sector is rewritten with the formatted code, and the optical disc is read again. It returns to the state 3 of FIG. 1 in which the recording and reproduction of the data can be performed.

FIG. 5 (e) not only protects information confidentiality by recording an information protection identification code and a password in the DDS identification code of the DDS1 sector of the DMA area and the reserve area 404, respectively, but also stores information in the user data area 202. Indicates the encrypted status. By the protection command having the password issued by the host computer 3, the protection / cancellation processing unit 30 makes the DDS identification code and the reserve area 4
The information protection identification code and the password are written in 04, respectively, and recorded in the DMA area of the optical disc by using the optical pickup, and the information in the user data area 202 of the optical disc is read by using the optical pickup, and the encryption / decryption processing of the drive device Encryption is realized by performing encryption processing in a circuit (not shown) and recording it in the user area of the disc.

On the other hand, when the protection release command is issued from the host computer 3 to the disc of FIG. 5 (e), the password written on the optical disc inserted in the drive device and the password of the protection release command are confirmed. However, only when they match, the protection / cancellation processing unit 30 performs DD.
By rewriting the S identification code into a formatted code and recording it on the optical disc by using the optical pickup, the user data area 20 becomes a normal formatted disc.
The information of No. 2 is read out, decryption processing is performed by the encryption / decryption processing circuit of the drive device, and the information is recorded again in the user area of the disk to return to the state of FIG. 5C, and again,
Enables data recording / playback on a disc.

In this case, the processing time is the same as in the full format, but the information concealment level is improved. In addition, since encryption and decryption processing is also supported by offline processing such as format processing, it has no direct relation to time constraints such as recording / playback transfer rate, and was essential for conventional encryption processing. High-speed encryption / decryption processing is not required, and software processing can be used. In this case, there are effects such as circuit reduction.

FIG. 6 is a schematic diagram showing an embodiment of the command transferred from the host computer to the drive device. FIG. 6A is a diagram showing a format command, which is a Command Desc for instructing the format.
ripple Block (hereinafter abbreviated as CDB) 601
Following a, a parameter 602 indicating a format mode such as quick or full is transferred. FIG. 6B is a diagram showing a write command, and the CDB 60 of the write instruction.
Write data 603 is transferred following 1b. Figure 6
(C) is a diagram showing a read command. The CDB 601c of the read instruction is transferred, and the drive device receives the read data from the disk and transfers it to the host. The commands shown in FIGS. 6A to 6C have already been standardized.

FIG. 6D shows an example of an information protection command for the disc. Similar to the format command, CDB 601d for instructing information protection is followed by key data (password) 604a, and the drive receives this command. As described above, the DD of the DMA area of the disc
A code indicating information confidentiality protection is recorded in the identification code of the S sector, and key data 604a is recorded in the reserve area 404 of the DMA area. FIG. 6E is a diagram showing an example of a disc information protection release command, and FIG.
C to instruct to release information protection as well as the information protection command of
Key data (password) 604b following the DB 601e
Is transferred, the drive receives this command,
When the key data 604b recorded in the DDS sector of the disc DMA area matches, the identification code of the DDS sector of the disc DMA area is replaced with the formatted code as described above.

FIG. 7 is a flow chart showing an embodiment of the information protection and cancellation processing operation of the disc in the second embodiment of the present invention. In the figure, step 701
Then, it is determined whether or not the optical disc is loaded. If no optical disk is loaded, the process returns to the original. When the optical disc 1 is loaded into the drive device 2 in step 701, the host computer 3 reads the DDS identification code of the optical disc 1 in step 702, and then the step 70
At 3, it is determined whether the optical disc is a protected disc or a non-protected disc based on the code of the DDS identification code.

In the case of a protected disk (state 4 in FIG. 1), in step 704, the host computer 3 instructs the user to input a password or the like, and in step 705.
Then, the protection release command with this password as a parameter is issued, and in step 706, if the drive device 2 matches the password information recorded in the DDS sector on the disc shown in FIG. In addition to rewriting the DDS identification code of No. 1 to a normal formatted code, at step 708, the encrypted information (including the user area) on the optical disk is decrypted to be rewritten to the decrypted information. Therefore, the process shifts to step 709, whereby the recording / reproducing on the disk becomes possible (that is, the state 3 in FIG. 1). When recording or reproduction is completed, the disc is ejected in step 710. If they do not match in step 706, the DDS identification code of the optical disc remains the disc protected by the drive device (state 4 in FIG. 1) and the encrypted information (including the user area) on the disc. No descrambling is also executed, and in step 711, recording / playback on the disk remains disabled, and step 712
Will eject the disc.

On the other hand, if it is judged in step 703 that the disk is not a protected disk, it is judged in step 713 whether it is a normal format disk (state 2 or 3),
For a normal format disc, step 714.
Then, the host computer 3 prompts the user to specify whether or not to protect the information. If not, step 709.
It becomes possible to record and reproduce as it is.

When the instruction to protect is issued in step 714, the host computer 3 instructs the user to input a password and the like in step 715, and step 716.
Then, a protection command with this password as a parameter is issued, and in step 717, the DDS identification code of the disc is rewritten to the information protection identification code indicating that it is a protected disc, and in step 718, the information on the disc is encrypted. Rewrite with encrypted information (including user area). As a result, recording / playback on the disk becomes impossible. If it is determined in step 713 that the disc is not a normal format disc (state 1), the disc is not formatted and recording / reproduction on the disc cannot be performed from the beginning.

In this embodiment, in the disc state in which recording / reproducing on the disc is possible and the disc state in which recording / reproducing on the disc is impossible, the disc is ejected from the drive from each state, and the start shown in FIG. By returning to step 1, the disk can be repeatedly protected and unprotected.

As described above, in the second embodiment of the present invention, the information recorded in the user area of the DVD-RAM optical disk can be encrypted and protected, so that the protected disk is protected. Information cannot be read unless the password that is the key to the identification code is entered, and even if the password is taken out, unless the command with the password is issued, the information recorded in the user area of the optical disk is decrypted. Because you can't
The data cannot be read or rewritten, so that valuable information cannot be stolen or tampered with by a third party. In addition, if a copy protection system such as CPRM is combined with this information protection system, it is not possible to duplicate a disc that has become playable by paying the fee, and therefore the disclosure of information is restricted to that disc only. Become. Also,
The password and the encryption process are not necessarily performed together, and it is possible to protect only the password or the combination of the information protection identification code and the encryption process of the first embodiment.

Next, a third embodiment of the present invention will be described. The protection and cancellation of the optical disc 1 is performed by using the password from the host computer 3 and the drive-specific information such as the serial number of the disc drive device 2 as the key information to protect the optical disc, so that the disc whose information is kept secret can be protected by other than the drive. Not playable.

FIG. 8 is a block diagram showing another embodiment of the optical disk recording / reproducing system according to the present invention. In this embodiment, instead of the user input such as the password from the host computer 3, the serial number of the disk drive device or the like is shown. It is possible to protect the confidentiality of information by using the drive-specific information of the above as key information. In FIG. 8, the same components as those in FIG. 3 are designated by the same reference numerals, and the description thereof will be omitted. In FIG. 8, the serial number recording unit 4 is newly added to the optical disk drive device 2.
0 is provided. For example, a serial number, which is unique information of the optical disk drive device 2, is recorded in a non-volatile memory such as an EEPROM, and is connected to the bus of the system processor 28.

The data recording / reproducing operation in the block structure of the optical disk recording / reproducing system shown in FIG. 8 is almost the same as the data recording / reproducing operation in the block structure of the optical disk recording / reproducing system shown in FIG. The system processor 28 of No. 2 stores the DDS identification code from the rewritable area of the lead-in area of the optical disc 1 via the front end processor 22 in the protection / cancellation processing unit 30, and the drive number recording unit 4
If the two information protection identification codes match, the code of the DDS identification code is replaced with the formatted code. , DVD and other DMA data to compose 1 block unit data, DVD
The encoder 26 adds ECC and records it in the DMA area of the disc by the same process as the normal recording data, and it can be used as a normal formatted optical disc.

As a result, the normal data reproduction from the disc 1 becomes possible, the pickup 21 reads the data corresponding to the reproduction address and the number of blocks added to the read command from the user area of the optical disc, and the front end processor 22 makes the disc. After the reproduction signal is generated and the DVD decoder 27 corrects the data error in units of one ECC block in synchronization with the clock reproduced by the clock reproduction signal processing unit 24, it is demodulated and the reproduction data is transmitted through the interface unit 29 to the host computer 3 Transfer to. In response to a write command from the host computer 3, the recording data is transferred via the interface unit 29 to D
It is received by the VD encoder 26 and is in the DVD format 1
After adding ECC to each ECC block, it is modulated into the disk recording data and supplied to the laser control 25.
The laser control 25 uses the pickup 21 to irradiate the user area of the disc with laser light for recording.

On the other hand, when a normal formatted optical disk is used as a protection disk, the protection command is issued by the host computer 3 so that the protection / cancellation processing section 30 records the identification code in the drive number recording section 40. By recording the information protection identification code using the unique information of the existing drive device as a key and recording it on the optical disc 1, it is impossible to record and reproduce the user data area.

However, if the information protection identification code recorded using the drive unique information recorded in the serial number recording section 40 of the optical disc drive device 2 as the key information and the information protection identification code received from the optical disc do not match, the above reproduction or The rewriting operation is not performed and the information is preserved. Further, in the optical disc recording / reproducing system shown in the third embodiment, it is possible to combine the information protection by the password of the protection command issued by the host computer, and further, by providing the encryption / decryption processing circuit, the user data area It is also possible to encrypt and record the information.

Furthermore, in the block configuration of the optical disc recording / reproducing system shown in the third embodiment, the information protection recorded by using the drive unique information recorded in the serial number recording section 40 of the optical disc drive device 2 as the key information. An information protection identification code in which a password or the like input from the host computer 3 is recorded as key information instead of the identification code can be transferred to the information protection and cancellation processing unit 30, and the optical disc recording / reproducing shown in FIG. Information protection protection similar to the system block configuration can be released.

In the third embodiment, the information recorded on the disk is restricted by the removable feature of the optical disk and cannot be reproduced by a drive device that does not record the information, or the serial information of the recorded drive device is used. Unless drive-specific information such as a number is input from the host computer, recording / reproduction can be performed on the disc, and an excellent effect can be expected for confidential storage of information unique to the drive device.

As described above, in the above-mentioned three embodiments of the present invention, the optical disc is a DVD-RAM disc, but other DVD-R / RW or D discs are used.
The present invention can also be applied to a write-once or rewritable optical disc such as VD + RW. Further, in the case of a write-once disc such as a DVD-R, instead of rewriting, it can be realized by a method of invalidating the previous recording portion and repeatedly writing to the remaining area.

According to the embodiments of the present invention described above, the confidentiality of the user information recorded on the rewritable optical disc can be protected, and even if the confidentially protected disc is taken out, the key information such as the password can be obtained. If you do not do this, you will not be able to obtain information and you can prevent the leakage of important information.

In the embodiment of the present invention, the rewritable area other than the user used area of the disc is used to cancel the prohibition of reading and writing of the data already recorded by the special command for protection such as the format command. Since the information identification code of is recorded, it is supported by offline processing such as format processing.
Since there is no time constraint such as the recording / reproducing transfer rate, high speed processing is not required for encryption and decryption processing, and software processing is also applicable, so that cost reduction such as circuit reduction can be achieved.

[0074]

As described above, according to the present invention, D
Using ordinary media such as VD-RAM, disk information can be protected by a protection command from the host computer, and the protection command and encryption processing can be combined to create an optical disk even if the information is illegally taken out by a third party. The recorded information can prevent reading.
Further, since the reproduction of the optical disc information can be limited to a specific drive device, it is possible to prevent the information from being read from another drive device.

[Brief description of drawings]

FIG. 1 is a transition diagram showing an example of state transition of an optical disc in an optical disc recording / reproducing system according to the present invention.

FIG. 2 is a schematic diagram showing a recorded state of a DVD-RAM disc.

FIG. 3 is a block diagram showing an embodiment of an optical disc recording / reproducing system according to the present invention.

FIG. 4 is a schematic diagram showing an example of a password recording position of a DVD-RAM disc.

FIG. 5 is a schematic diagram showing a normal state and an encrypted state of an optical disc format, an information protection identification code, and user data.

FIG. 6 is a schematic diagram showing an example of a command transferred from a host computer to a drive device.

FIG. 7 is a flow chart showing an example of the operation of the information protection and cancellation processing of the disc in the second example of the present invention.

FIG. 8 is a block diagram showing another embodiment of the optical disc recording / reproducing system according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Optical disk, 2 ... Optical disk drive device, 3 ... Host computer, 21 ... Pickup, 22 ... Front end processor, 23 ... Servo control, 24
… Clock reproduction signal processing, 25… Laser control,
26 ... DVD encoder, 27 ... DVD decoder, 28
... interface, 29 ... protection / release processing section, 30 ... drive number recording section.

Front page continuation (51) Int.Cl. ⁷ Identification code FI theme code (reference) G11B 20/12 G11B 20/12 H04N 5/91 H04N 5/91 P (72) Inventor Yoshiki Umezawa 1410 Inada, Hitachinaka City, Ibaraki Prefecture Address F-Term in Hitachi Digital Media Products Division (reference) 5B017 AA03 BA05 BA07 CA09 CA16 5C053 FA13 FA23 GB01 GB06 LA11 5D044 AB02 BC04 BC06 CC06 DE29 DE49 DE50 DE54 EF05 FG18 GK12 HL08 5D090 AA01 BB36 CC02 CC14 CC14 CC14 CC16 CC14

Claims (14)

[Claims] 1. An optical disc having a rewritable area other than the user use area of the disc, and an identification code area defining a disc format presence / absence in the rewritable area other than the user use area, and an optical pickup for the optical disc. An optical disc drive device for recording / reproducing by the above, an optical disc, and a host computer for controlling the optical disc drive device. The optical disc drive device is provided with an information protection and cancellation processing section, and has protection identification information issued by the host computer. Based on the protection command
The information protection and release processing unit writes the protection identification information in the identification code area of the optical disc and records it on the optical disc, or based on a protection release command having protection identification information issued by the host computer, The protection identification information of the protection release command and the identification code of the optical disc inserted in the optical disc drive device are stored in the information protection and release processing unit to determine whether they match, and only when they match, the identification code is formatted. The optical disc recording / reproducing system is characterized in that the optical pickup can be recorded on the optical disc. 2. An optical disc having a rewritable area other than the user use area of the disc, and an rewritable area other than the user use area having an identification code area and a reserve area for defining presence or absence of a disk format, and an optical pickup. An optical disk drive device for recording / reproducing on / from the optical disk, and an optical disk and a host computer for controlling the optical disk drive device. The optical disk drive device is provided with an information protection and cancellation processing section, and a password issued by the host computer is set. On the basis of the protection command possessed by the information protection and cancellation processing section, the protection identification information is written in the identification code area and the password is written in the reserved area and recorded on the optical disc, or
Based on the protection release command having the password issued by the host computer, the password of the protection release command and the password written in the reserve area of the optical disc mounted in the optical disc drive device are supplied to the information protection and release processing unit. An optical disk recording characterized by storing and performing coincidence determination, rewriting the code of the identification code recorded in the identification code area to a formatted code only when they match, and recording on the optical disk by the optical pickup. Playback system. 3. The optical disk recording / reproducing system according to claim 2, wherein the optical disk drive device is provided with an encryption / decryption processing circuit, and the information protection and cancellation are performed based on a protection command issued by the host computer having a password. The processing unit writes the protection identification information in the identification code and the password in the reserve area.
The encryption / decryption processing circuit performs encryption processing on the rewritable area of the optical disc, and the optical pickup records it on the optical disc, or based on a protection release command having a password issued by the host computer, The password of the protection release command and the password recorded in the reserve area of the optical disc mounted in the optical disc drive device are stored in the information protection and release processing unit to determine whether they match, and the identification code is formatted only when they match. An optical disk recording / reproducing characterized by rewriting to an already-encoded code, decoding the encrypted information in the optical disk rewritable area with the encryption / decryption processing circuit, and recording on the optical disk with an optical pickup. system. 4. An optical disk having a rewritable area other than the user-use area of the disk, and an identification code area for defining the presence or absence of a disk format in the rewritable area other than the user-use area, and recording / reproducing on the optical disk. An optical disk drive device, an optical disk, and a host computer that controls the optical disk drive device are provided, and the optical disk drive device is provided with an information protection and cancellation processing unit and a drive unique information recording unit that stores the optical disk drive unique information. Based on a protection command issued by a computer, the information protection and cancellation processing section writes protection identification information having the optical disk drive unique information as key information in the identification code area of the disk and records it on the optical disk, or , Protection solution issued by the host computer Based on the command, the information protection identification code having the optical disc drive unique information of the drive unique information recording unit as key information and the identification code of the optical disc mounted in the optical disc drive device are stored in the information protection and cancellation processing unit. The optical disc recording / reproducing system is characterized in that the discrimination code is discriminated according to the above, and the discrimination code is rewritten to the formatted code only when the coincidence is made, and the disc is recorded on the optical disc by the optical pickup. 5. An optical pickup, an information protection / cancellation processing unit, and a protection command issued by a host computer, which has protection identification information, based on a protection command, the information protection / cancellation processing unit stores the identification code area in the optical disc. Means for recording protection identification information, and the protection identification information of the protection release command and the identification code reproduced from the optical disk are recorded on the basis of a protection release command having protection identification information issued by the host computer. The identification code written in the rewritable area of the optical disc is rewritten into a formatted code and stored in the optical disc by the optical pickup only when the disc is stored in the protection and cancellation processing unit to determine the coincidence. An optical disk drive device characterized by: 6. An optical pickup, an information protection / release processing section, and a protection identification information in an identification code area of an optical disc in the information protection / release processing section based on a protection command issued by a host computer and having a password. And a means for recording the password in the reserved area of the optical disk, and a protection cancel command having a password issued by the host computer and the password written in the reserved area of the optical disk for the information protection and cancellation processing unit. The identification code recorded in the identification code area of the optical disc is rewritten into a formatted code and recorded on the optical disc by the optical pickup only when they coincide with each other. Optical disk drive device. 7. The optical disk drive apparatus according to claim 6, wherein an encryption / decryption processing circuit is provided, and the encryption / decryption processing circuit performs encryption processing on a rewritable area of the optical disk, and then the optical pickup. In the case where the password of the protection release command and the password recorded in the reserve area of the optical disc match based on the protection release command having the password issued by the host computer, An optical disc recording / reproducing system characterized in that an encryption / decryption processing circuit performs a decryption process on the encrypted information in the rewritable area of the optical disc, and an optical pickup records the information on the optical disc. 8. An optical pickup, an information protection / cancellation processing unit, a unique information recording unit for storing unique information of a drive device, and an information protection / cancellation processing unit based on a protection command issued by a host computer. Means for recording protection identification information having the unique information as key information in the identification code area of the optical disc, and the unique information of the unique information recording section based on a protection release command issued by the host computer. The information protection identification code having the key information as the key information and the identification code of the optical disc are stored in the information protection and cancellation processing unit to determine whether they match, and only when they match, the identification code is rewritten to a formatted code, and An optical disk drive device for recording on the optical disk with a pickup. 9. A step of recording protection identification information in an identification code area of an optical disk based on a protection command having a password issued by the host computer and recording the password in a reserved area of the optical disk, and the host computer The step of determining whether the protection release command having the password to be issued and the password written in the reserve area of the optical disc match, and the code of the identification code recorded in the identification code area of the optical disc is formatted only when the password is issued. Rewrite the code,
And a step of recording on the optical disc. 10. The recording / reproducing method according to claim 9,
A step of performing an encryption process on the rewritable area of the optical disc and recording it on the optical disc based on a protection command having a password issued by the host computer; a password of the protection release command and the reserved area of the optical disc. Only when the recorded passwords match, a step of performing the decryption processing of the encrypted information in the rewritable area of the optical disc and recording the information on the optical disc is performed. 11. A step of recording the protection identification information having the unique information of the drive device as key information in the identification code area of the optical disk based on the protection command issued by the host computer, and the protection release issued by the host computer. A step of determining whether or not the information protection identification code having the unique information as key information and the identification code of the optical disc, based on a command, determines that the identification code is rewritten to a formatted code only when they coincide with each other; And a step of recording the data on the recording / reproducing method. 12. A user use area and a rewritable area other than the user use area, and the rewritable area other than the user use area is provided with an identification code area for defining presence or absence of a disk format and a reserve area. Based on the protection command having the password issued by the host computer, the protection identification information is recorded in the identification code area, the password is recorded in the reserve area, and the protection cancellation command having the password issued by the host computer is issued. On the basis of the above, when the password of the protection release command and the password written in the reserve area match, the code of the identification code recorded in the identification code area is rewritten to a formatted code. Possible optical disc. 13. The rewritable optical disk according to claim 12, wherein the rewritable area is encrypted, and the password of the protection cancellation command and the password are issued based on a protection cancellation command issued by the host computer. A rewritable optical disc in which the decrypted information is recorded in the optical disc rewritable area only when the passwords recorded in the reserved area of the optical disc match. 14. A protection command issued by a host computer, comprising a user use area, a rewritable area other than the user use area, and an identification code area for defining the presence or absence of disk format in the rewritable area other than the user use area. On the basis of the above, protection identification information having the unique information of the drive device as key information is recorded in the identification code area,
Based on a protection release command issued by the host computer, when the information protection identification code having the unique information as key information and the identification code match, the identification code is rewritten to a formatted code. Rewritable optical disc.