JPH0757375A - Optical disk device - Google Patents

Abstract

PURPOSE:To effectively evade an illegal copy by dividing the recording area into sectors, recording user data on each sector and also reproducing the user data based on discrimination data. CONSTITUTION:When the reproduced vendor ID is noncoincident with an ID for comparison, it is decided as the case that the read command of this optical disk is issued by the application program other than the program to process for retrieval of the optical disk 2. Thus, in the optical disk 1, the user data are outputted for the normal optical disk 2 only at the time when the read command is issued from the corresponding application program, thereby the illegal copy is prohibitted.

Description

Detailed Description of the Invention

[0001]

[Table of Contents] The present invention will be described in the following order. Field of Industrial Application Conventional Technology Problems to be Solved by the Invention Means for Solving the Problems (FIGS. 1, 3, 4, and 6) Operation (FIGS. 1, 3, 4, and 6) Implementation Example (1) First Example (FIGS. 1 to 3) (2) Second Example (FIGS. 1 and 4 to 6) (3) Other Examples Effects of the Invention

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk device,
For example, it can be applied to an optical disk device used as an auxiliary storage device of a computer.

[0003]

2. Description of the Related Art Conventionally, there is an optical disk device of this type which can be used as an auxiliary storage device such as a computer.

In other words, an optical disk applied to this type of optical disk device can be mass-produced by applying a manufacturing method similar to that of the compact disk, whereby a large amount of large-capacity data can be supplied. Therefore, if this type of optical disk device is used as an auxiliary storage device for a computer, text data such as a dictionary with a large amount of data can be supplied simply and in large quantities, and this allows connection to the computer and usability of the computer. Is designed to be able to improve.

[0005]

By the way, when various data are supplied using this type of recording medium, there is a risk that the data may be illegally copied. In this case, there can be considered a method of prohibiting this kind of illegal copy by performing copy protection like data supplied via a floppy disk, etc., but this method has a feature that copying cannot be completely prohibited. is there.

The present invention has been made in consideration of the above points, and an object thereof is to propose an optical disk device capable of effectively avoiding this kind of illegal copying.

[0007]

In order to solve such a problem, in the present invention, in response to a predetermined control command,
In the optical disk device 1 for irradiating the disk-shaped recording medium 2 with a light beam and receiving the reflected light of the light beam to reproduce the user data recorded in the disk-shaped recording medium 2, the disk-shaped recording medium 2 has a recording area. It is divided into sectors, and user data D0 to D511 is assigned to each sector in a predetermined data unit.
And the identification data VU1 to VU4 of the user data D0 to D511, the error detection and correction code EC of the user data D0 to D511 and the identification data VU1 to VU4.
Optical disc device 1 for recording C1,1 to ECC5,16
Reproduces the user data D0 to D511 based on the identification data VU1 to VU4.

Further, according to the second aspect of the invention, the user irradiating the disk-shaped recording medium 2 with a light beam in response to a predetermined control command and receiving the reflected light of the light beam to record on the disk-shaped recording medium 2. In the optical disk device 1 for reproducing data, the disk-shaped recording medium 2 divides the recording area into sectors, records user data D0 to D511 in predetermined sectors in each sector, and records user data D0 to D511. The identification data VU1 to VU4, the user data D0 to D511, and the error detection and correction codes ECC1, 1 to ECC5, 16 of the identification data VU1 to VU4 are recorded, and the optical disk device 1 responds to the control command by identifying data VU1 to VU1. Set the comparison data for VU4,
After performing error correction processing on the identification data VU1 to VU4, logical operation processing is executed with the comparison data, and predetermined data processing is executed on the user data D0 to D511 based on the logical operation result.

Further, in the third aspect of the invention, the disk device 1 has the identification data VU1 when the logical operation result is a predetermined value.
To user data D0 to D511 to which VU4 is assigned
Is output and the logical operation result is other than the predetermined value, the user data D0 to which the identification data VU1 to VU4 are assigned are output.
Data processing is executed by stopping the output of D511 and sending an error code indicating that an error has occurred in the reproduction processing.

Further, in the fourth invention, the optical disk device 1 resets the address data of the sector based on the identification data VU1 to VU4, and based on the reset address data, the user data D0 to 0 of each sector. D511
By reproducing the user data D0 to D511 based on the identification data VU1 to VU4.

[0011]

The recording area is divided into sectors, and user data D0 to D511 are recorded in each sector in predetermined data units, and predetermined identification data VU1 to VU4, user data D0 to D511 and identification data VU1 to VU4 are recorded. The user data D0 to the disk-shaped recording medium 2 in which the error detection and correction codes ECC1,1 to ECC5,16 are recorded.
If the user data D0 to D511 are reproduced with reference to the identification data VU1 to VU4 of D511, the user data D0 to D511 is not processed by the corresponding application program.
When reproducing the data, or when reproducing the copied disk-shaped recording medium, the reproduction of the user data D0 to D511 can be stopped.

Further, comparison data for the identification data VU1 to VU4 is set corresponding to the control command, error correction processing is performed on the identification data VU1 to VU4, and then logical operation processing is executed between the comparison data and the comparison data. When predetermined data processing is performed on the user data D0 to D511 based on the logical operation result and the user data D0 to D511 is processed by an unsupported application program,
Further, when processing the copied disk-shaped recording medium, the processing of the user data D0 to D511 can be stopped.

That is, when the logical operation result is other than the predetermined value, the output of the user data D0 to D511 to which the identification data VU1 to VU4 are assigned is stopped, and an error code indicating that an error has occurred in the reproduction process is transmitted. Thus, it is possible to effectively avoid an illegal copy.

Further, the address data of the sector is reset based on the identification data VU1 to VU4, and the user data D0 of each sector is based on the reset address data.
By reproducing D511, it is possible to prevent the illegally copied application program from being activated.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

(1) First Embodiment In FIG. 1, reference numeral 1 denotes an optical disk device as a whole,
The desired data is recorded / reproduced by using the recordable / reproducible optical disk 2, and further the desired data is reproduced from the reproduction-only optical disk 2.

That is, the optical disk device 1 is produced by applying the magneto-optical recording method to record / reproduce desired data and the same method as the compact disk. A read-only ROM (read-only memory) disk is also applicable. The optical disk device 1 drives the spindle motor S by the spindle motor control circuit 3 to rotationally drive the optical disk 2 at a predetermined rotation speed.

In this state, the laser control circuit 4 drives a laser diode built in the optical pickup 5 to irradiate the optical disk 5 with a light beam. The optical pickup 5 receives the reflected light of this light beam by a predetermined light receiving element and outputs the light receiving result to the RF signal processing circuit 6.

The RF signal processing circuit 6 performs current-voltage conversion processing on the received light result, and then performs addition / subtraction processing by a predetermined matrix circuit to obtain the tracking error signal TE,
The focus error signal FE is generated, and the tracking error signal TE and the focus error signal FE are output to the servo control circuit 7. As a result, the optical disk device 1
With the servo control circuit 7, the tracking error signal TE,
By moving the optical pickup 5 and the objective lens built in the optical pickup 5 on the basis of the focus error signal FE, tracking control and focus control can be performed.

In addition to this, the servo control circuit 7 is adapted to move the optical pickup 5 in the radial direction of the optical disc in response to a control command output from the system control circuit 9, whereby the optical disc apparatus 1 is moved. , The optical disk 5 is sought to access the optical disk 2. Further, the RF signal processing circuit 6 performs the addition / subtraction processing on the light reception result, and the signal level changes according to the change of the reproduction signal (which is a so-called sum signal) whose signal level changes according to the amount of reflected light and the polarization plane of the reflected light. And a reproduction signal (which is a so-called difference signal) that changes.

As a result, when reproducing the optical disk 2 which is a ROM disk, the optical disk device 1 reproduces desired data by binarizing this sum signal and then processing it in the subsequent data modulation / decoding circuit 8. To be able to
Further, the address data of the reproduction position (that is, a physical address) can be detected. On the other hand, when the optical disc device 1 reproduces the optical disc 2 which is a magneto-optical disc, after binarizing this difference signal,
The subsequent data modulation / decoding circuit 8 processes it so that desired data can be reproduced, and the sum signal is further taken in at a predetermined cycle and processed so that the address data at the recording / reproducing position can be detected. ing.

Thus, the system control circuit 9 can seek the optical pickup 5 by issuing a control code to the servo control circuit 7 on the basis of the address data thus detected.

The data modulation / decoding circuit 8 obtains reproduced data by binarizing the reproduced signal output from the RF signal processing circuit 6 and then 7-2 demodulating the reproduced signal. The reproduced data is buffered. Output to the control circuit 10. At this time, the error detection / correction circuit (ECC) 11 performs error correction processing on the reproduction data by using the error detection / correction code reproduced together with the reproduction data, whereby the optical disk device 1 surely obtains desired data. It is designed to be playable.

At the time of this error correction processing, the error detection / correction circuit 11 outputs the error correction result to the system control circuit 9,
As a result, the system control circuit 9 determines whether or not the desired data has been correctly reproduced, issues a control code as necessary, and repeats the reproduction operation. Further, when an error occurs in the reproduced data, the system control circuit 9 causes the SCSI (smal
l computer system interface) The host computer is interrupted via the interface circuit (I / F) 12, and an error code indicating that an error has occurred is issued to the host computer.

The buffer control circuit 10 sequentially inputs the reproduced data reproduced in this manner and stores it in the buffer memory 13, and the reproduced data stored in the buffer memory 13 is sent from the SCSI interface circuit 12 to the host at a predetermined timing. Output to the computer. The system control circuit 9 is the SCSI interface circuit 1
By controlling the entire operation in response to a control command issued from the host computer via 2, the optical disk device 1 is configured to execute the series of reproduction processes. It is adapted to output a large amount of data to the host computer.

On the other hand, when a write control command is issued from the host computer with the optical disk 2 made of a magneto-optical disk loaded, the system control circuit 9 switches the entire operation mode to the recording mode. .
In response to this, the buffer control circuit 10
Input data input via the SI interface circuit 12 is stored in the buffer memory 13 and output to the data modulation / decoding circuit 8 at a predetermined timing.

At this time, the error detection / correction circuit 11 generates an error detection / correction code of this input data and outputs it to the data modulation / decoding circuit 8, and the data modulation / decoding circuit 8 receives this input data and the error detection / correction code. 2-7 is modulated and converted into recording data. The RF signal processing circuit 6 forms a reference clock for recording on the basis of the reproduction result composed of the sum signal, and outputs this reference clock to the laser control circuit 4.

The laser control circuit 4 drives the optical pickup 5 in synchronism with this reference clock to switch the light amount of the light beam to the light amount at the time of recording and intermittently irradiate the light beam. As a result, the optical disk device 1 applies a modulation magnetic field to the irradiation position of this light beam,
By switching the polarity of this modulating magnetic field according to the recording data, the method of thermomagnetic recording can be applied to record desired data.

(1-1) System Control Circuit The system control circuit 9 refers to the vendor-unique data recorded on the optical disc 2 when reproducing the optical disc 2 in this way, and refers to the user data of each sector. The data is reproduced so that an illegal copy of the user data assigned to each sector can be effectively avoided.

That is, in this type of optical disc 2, the recording area is divided into sector units, and data is recorded in each sector according to the format shown in FIG. Here, this format is an ISO (internatinal stand) for an optical disc 2 having a diameter of 3.5 inches.
ards organization), one sector is formed by 525 bytes of data.

In each sector, a 512-byte area of D0 to D511 is assigned to user data, and the following VU1 to VU are assigned.
The 4 bytes of U4 are allocated to vendor-unique data, and in the optical disc device 1, this vendor-unique data can be freely set when the optical disc 2 is created. Further, in each sector, 5 bytes of CRC1 to CRC4 are assigned to the parity code, and the remaining E1,1 to E5,16 are 5 ×.
16 bytes are allocated to the code for error detection and correction.

Accordingly, in the optical disc device 1,
When a read command is issued via the SCSI interface circuit 12, the optical disk 2 is reproduced in sector units, and 512 bytes of data allocated to user data out of 525 bytes of one sector is subjected to error detection and correction processing. It is designed to output.

At this time, the system control circuit 9 refers to the vendor-unique data by executing the processing procedure shown in FIG. 3, thereby effectively avoiding an illegal copy. That is, the system control circuit 9 determines that the step SP1
To Step SP2, it is determined here whether or not a command is input from the host computer.

If a negative result is obtained here, the system control circuit 9 repeats step SP2, whereas if a positive result is obtained, the system control circuit 9 moves to step SP3 and the vendor I
It is determined whether the command is the D setting command.

That is, in this embodiment, a unique code is assigned to the application program for searching and processing the data stored in the optical disk 2, and the optical disk 2 sets this unique code in the vendor ID and This vendor ID is uniquely recorded in the sector vendor. Corresponding to this, the application program for retrieving the data stored in the optical disk 2 issues a predetermined control command (for example, a command such as mode select) to issue the optical disk device 1
When switching the setting of, the identification data corresponding to the vendor ID is set.

Accordingly, the system control circuit 9 determines whether or not the command issued from the host computer has a code for setting identification data, thereby determining whether or not the command is a vendor ID setting command. When a negative result is obtained, the process proceeds to step SP4 and it is determined whether or not it is a read command. If a negative result is obtained here,
The system control circuit 9 shifts to step SP5, performs normal processing such as operation mode switching corresponding to the control command, and then returns to step SP2.

On the other hand, when a positive result is obtained in step SP3, the system control circuit 9 causes the step S
Moving to P6, the operation mode is set to the special mode, the control code added to this control command is analyzed, and the ID for comparison is set. Thus, in the optical disc device 1, when the application program corresponding to the optical disc 2 issues a predetermined control code, the comparison ID is set based on this control code.

As a result, the system control circuit 9 sets the operation mode of the entire optical disk device 1 to the special mode, and then returns to step SP2. On the other hand, when a read command is issued from the host computer, a positive result is obtained in step SP4, and the system control circuit 9 moves to step SP7.

Here, the system control circuit 9 judges whether or not the current operation mode is the special mode, and if a negative result is obtained here, the system control circuit 9 moves to step SP5 to reproduce the user data designated by the read command and then step. Return to SP2.
On the other hand, when a read command is input in the special mode, a positive result is obtained in step SP7, so that the system control circuit 9 moves to step SP8 and the sector designated by this read command is read. To play.

Subsequently, the system control circuit 9 proceeds to step S
In P9, the vendor unique data reproduced here is subjected to error correction processing to detect the vendor ID, and a predetermined logical operation processing is executed between this vendor ID and the ID for comparison to obtain this vendor ID. It is determined whether the ID and the ID for comparison match. Vendor I played here
If D matches the ID for comparison, in this case, the read command for the optical disk 2 is issued by the application program for searching the optical disk 2. SP
In step 10, the reproduced user data is output to the host computer.

On the other hand, when the reproduced vendor ID does not match the ID for comparison, in this case, the read command of this optical disk is issued by an application program other than the application program for searching the optical disk 2. It can be judged that it has been done. Further, in this type of optical disk device 1, only user data can be accessed from the outside, and in this case, the vendor of the optical disk 2 is uniquely correct.
When D is not recorded, that is, it can be determined that the data stored in the optical disk 2 is copied data.

As a result, when the optical disk device 1 obtains a negative result in step SP9, step SP1
The process moves to 1 and issues a command indicating that an error has occurred during reproduction to move to step SP2, whereby the reproduced user data is not output to the host computer and the process corresponding to the read command is stopped.

Accordingly, in the optical disc device 1,
User data can be output to the legitimate optical disc 2 only when a read command is issued from the corresponding application program, whereby illegal copying can be prohibited, and the illegally copied optical disc 2 can be prevented. Can effectively avoid an illegal copy by stopping the reproduction process. At this time, by issuing a command indicating that an error has occurred during playback and canceling the process corresponding to the read command, the user is not aware that the process of canceling the output of user data has been executed. Processing can be stopped.

(1-2) Effect of Embodiment With the above configuration, when the comparison ID set in the application program and the vendor ID uniquely assigned to the vendor match, the playback is performed in response to the read command. By outputting the generated user data to the host computer, it is possible to output the reproduced user data only when a read command is issued from the corresponding application program to the regular optical disk, thereby enabling illegal copying. It can be avoided.

(2) Second Embodiment In this embodiment, the logical sector of the optical disk 2 is reset based on the vendor ID uniquely assigned to the vendor, thereby effectively avoiding illegal copy.

That is, in this embodiment, as shown in FIG. 4, the optical disk 2 records directory data, file allocation table (FAT), etc. from the head sector, and then sequentially records files of the application loader. To do. Further, the optical disc 2 records directory data, a file allocation table (FAT) following the file of the application loader, and subsequently records a file of the application program.

Thus, as shown in FIG. 5, when the application program is started in the same manner as a normal optical disk, the optical disk 2 is initially operated by the operating system (OS) of the host computer with respect to the drive. By issuing a playback command from 0, the directory data and the file allocation table located in the first sector are accessed by the host computer, and then the subsequent application loader loads them in the host computer.

In the normal optical disk, the processing of the application program is started based on the application loader loaded in the host computer, whereas in this embodiment, the application loader issues the application program. Corresponding to the command
The system control circuit 9 executes the processing procedure shown in FIG. 6, and subsequently, the sector in which the directory data and the file allocation table are recorded is reset to the logical sector 0.

That is, the system control circuit 9 shifts from step SP21 to step SP22, and determines here whether or not a command is input from the host computer.
If a negative result is obtained here, the system control circuit 9
While step SP22 is repeated, when an affirmative result is obtained, step SP23 is entered and it is determined whether or not the command is a logical sector search command. If a negative result is obtained here, the system control circuit 9 moves to step SP24,
After performing the normal processing such as the operation mode switching corresponding to the control command, the process returns to step SP2.

On the other hand, when a logical sector search command is issued from the host computer, the system control circuit 9 proceeds to the next step SP25, sets the target sector (TS) to 0, and then proceeds to step SP2.
Moving to 6, the sector of this logical sector 0 is reproduced. As a result, the system control circuit 9 reproduces the sector of the logical sector 0 in which the directory data is newly recorded in this case, and takes in the vendor unique data from the reproduction processing result.

That is, in this type of optical disk 2, data of value 0 is usually recorded as vendor-unique data, and as described above, the content of this data is inaccessible from the outside. The optical disk 2 records the data of the predetermined value X in the vendor unique to be reset to the logical sector 0 by using the characteristic of this vendor unique, and records the vendor ID other than the value X in the remaining sectors. It is designed to do.

As a result, the system control circuit 9 fetches vendor-unique data for the sector of the logical sector 0, then moves to step SP27, and judges whether the fetched vendor-unique data has a predetermined value X or not. If a negative result is obtained, the process proceeds to step SP28. Here, the system control circuit 9 increments the value of the target sector TS by 1 and then
Move to step SP29, where target sector TS
Is the last sector. In this case, since a negative result is obtained, the system control circuit 9 then returns to step SP26 to detect the vendor ID for the following sector.

As a result, the system control circuit 9 sequentially steps SP26-SP27-SP28-SP29-SP.
When the vendor ID of the value X is detected by repeating the processing procedure of step 26, a positive result is obtained in step SP27, and thus the process proceeds to step SP30. Here, the system control circuit 9 sets the sector in which the vendor ID of this value X is detected to the sector of the logical sector 0 and sets the step SP.
Return to 22.

That is, the system control circuit 9 previously manages the management data (DDS: disk definition strut) of the optical disk 2.
cture) and the detected logical sector is updated to update the logical sector in the same manner as when a new optical disk 2 is loaded, and the optical data recording user data from the reset logical sector 0 is updated. As in the case of reproducing the disk, the optical disk 2 is accessed in response to the subsequent command from the host computer.

As a result, when a command is subsequently issued from the application loader, the system control circuit 9 reproduces and outputs the directory data and the file allocation table based on the reset logical sector, and then continues. Play and output the application program. At this time, by resetting the logical sector, the operation system on the host computer side can perform the same processing as when executing the application program for the normal optical disk regardless of the resetting of the logical sector. it can.

On the other hand, when the vendor ID of the value X cannot be detected, the system control circuit 9 moves to step SP31 when the final sector is reached and a positive result is obtained in step SP29. Here, the system control circuit 9 issues a command indicating that an error has occurred during reproduction, and returns to step SP22.

As a result, when the optical disk device 1 starts the application program recorded in the optical disk for which the user data is copied, the optical disk device 1 cannot copy the vendor unique. The ID cannot be detected, which makes it difficult to launch this application program correctly. Therefore, in the optical disc device 1,
Therefore, illegal copying can be effectively avoided.

According to the configuration shown in FIG. 6, when the contents of the optical disk 2 are illegally copied by resetting the logical sector based on the vendor uniqueness,
The copied application program cannot be started correctly, and thus illegal copying can be effectively avoided.

(3) Other Embodiments In the first embodiment described above, the logical operation processing is performed to judge whether or not the vendor ID and the comparison ID match. However, the present invention is not limited to this. Is not limited to this, by performing various logical operation processes between the vendor ID and the comparison ID to determine whether or not a predetermined operation result is obtained, the vendor ID that is the identification data of the user data can be obtained. It can be widely applied to the case of processing user data as a reference.

Further, in the above-mentioned second embodiment, the case where the vendor unique to be reset in the logical sector 0 is set to a predetermined value has been described, but the present invention is not limited to this, and logical operation processing is performed to a predetermined value. You may set the vendor unique to be reset to logical sector 0 so that
Instead of this, a sector to be reset to logical sector 0 may be designated by a vendor unique of a predetermined sector.

[0061]

As described above, according to the present invention, the recording area is divided into sectors, user data is recorded in each sector in a predetermined data unit, and the user data identification data and error detection / correction data are recorded. When the user data is processed by the application program that does not correspond to the disc-shaped recording medium having the code recorded by reproducing the user data based on the identification data, the copied disk-shaped recording medium is further processed. In this case, it is possible to stop the processing of the user data, thereby obtaining an optical disk device that can effectively avoid an illegal copy of the user data.

[Brief description of drawings]

FIG. 1 is a block diagram showing an optical disk device according to an embodiment of the present invention.

FIG. 2 is a schematic diagram for explaining a sector format of the optical disk.

FIG. 3 is a flowchart for explaining the operation.

FIG. 4 is a schematic diagram for explaining an optical disk applied to a second embodiment.

FIG. 5 is a schematic diagram for explaining the operation of the optical disk device.

FIG. 6 is a flowchart for explaining the operation.

[Explanation of symbols]

1 ... Optical disk device, 2 ... Optical disk, 6 ... RF
Signal processing circuit, 8 ... Data modulation / decoding circuit, 9 ... System control circuit.

Claims (4)

[Claims] 1. An optical disk for irradiating a disk-shaped recording medium with a light beam in response to a predetermined control command, receiving reflected light of the light beam, and reproducing user data recorded on the disk-shaped recording medium. In the device, the disk-shaped recording medium divides a recording area into sectors, records the user data in a predetermined data unit in each sector, and identifies the user data, the user data, and the identification data. An optical disc device for recording an error detection / correction code, wherein the optical disc device reproduces the user data based on the identification data. 2. An optical disk for irradiating a disk-shaped recording medium with a light beam in response to a predetermined control command, receiving reflected light of the light beam, and reproducing user data recorded on the disk-shaped recording medium. In the device, the disk-shaped recording medium divides a recording area into sectors, records the user data in a predetermined data unit in each sector, and identifies the user data, the user data, and the identification data. An error detection / correction code is recorded, the optical disk device sets comparison data for the identification data in response to the control command, performs error correction processing on the identification data, and then outputs the data to the comparison data. And performing predetermined data processing on the user data based on the result of the logical operation. Optical disc system. 3. The disk device outputs the user data to which the identification data is assigned when the logical operation result has a predetermined value, and outputs the identification data when the logical operation result has a value other than the predetermined value. 3. The optical disk device according to claim 2, wherein the output of the assigned user data is stopped, and the data processing is executed by sending an error code indicating that an error has occurred in the reproduction processing. . 4. The optical disc device resets the address data of the sector on the basis of the identification data, and reproduces the user data of each sector based on the reset address data, thereby performing the identification. The optical disk device according to claim 1, wherein the user data is reproduced on the basis of data.