JP2003249012A - Disk drive and access restricting method for disk - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disk drive by which access to a disk is easily restricted without using a password. <P>SOLUTION: When data are recorded to the disk 20A by the disk drive 10A, the identification information α specific to the disk drive 10A is recorded on the disk 20A together with the data. When the read operation is performed by setting the disk 20A to a disk drive other than the disk drive 10A, the read of the data recorded on the disk 20A is prohibited since the identification information α recorded on the disk 20A and the identification information stored in another disk drive are not coincident. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a CD-R and a CD-R.
The present invention relates to a disk device that restricts reading of data recorded in an RW or the like by another disk device.

[0002]

2. Description of the Related Art CD-Rs and CD-RWs are writable optical discs, which can be inserted into a disc drive equipped in a personal computer (hereinafter referred to as a PC) to record data. ing.

By the way, some data created by a PC cannot be read unnecessarily by a third party.
Some kind of security is required for the disc on which such data is recorded. As a method for this, a method using a password has been conventionally adopted. JP-A-11-296436 and JP-A-10-1
Japanese Patent No. 33954 describes a technique for restricting access to a disk by using a password.

[0004]

However, in the method using a password as described above, an operation of setting a password and inputting each time access is required,
In addition, there is a problem that if the password is forgotten, the disk cannot be accessed.

Therefore, an object of the present invention is to provide a disk device which can very easily restrict access to a disk without using a password.

[0006]

In the disk apparatus according to the present invention, when data is recorded on the disk, identification information unique to the disk apparatus is recorded on the disk. When reading data from a disc, first, the identification information recorded on the disc is read, and it is determined whether this identification information matches the identification information of the disc device. Then, if both parties do, the reading of the data recorded on the disk is permitted, and if the two do not match, the reading of the data recorded on the disk is prohibited.

With this arrangement, when the disc is reproduced by a device other than the disc device in which the data is recorded, the disc information cannot be read because the identification information does not match, and the device in which the data is recorded cannot read the disc data. The data can be read only when playing the disc. Recording and verification of the identification information is automatically performed by the disk device, and password setting and input operations are not required, so that access restriction to the disk can be easily realized.

Further, according to the present invention, it is determined whether or not the data to be recorded on the disc is data which is prohibited to be read by another disc device, and if the data is the data which is prohibited to be read, the identification information is recorded on the disc. However, if the data is not prohibited to be read, the identification information is not recorded on the disc. By doing so, it is possible to prohibit reading of data from the disk by another device only when access restriction is required.

Further, in the present invention, of the data and the identification information to be recorded on the disc, only the identification information is encrypted and recorded. By doing this, the identification information is encrypted and the security is further improved, and the data cannot be read unless the identification information can be decrypted. Therefore, the data is automatically protected without being encrypted. Become.

[0010]

1 is a schematic block diagram of a disk device according to the present invention. In the figure, 10 is CD-
A disk device that handles disks such as R and CD-RW,
1 is a disc reading unit for reading information recorded on the disc, 2 is a disc writing unit for recording information on the disc, 3
Is a memory for storing information to be recorded on the disk, 4 is a disk drive unit including a mechanism and circuit for driving the disk, 5 is an interface for communicating with a host device such as a PC, and 6 is information for the disk. A control unit that controls reading and writing.

FIG. 2 is a table showing a part of the stored contents of the memory 3. The memory 3 has a disk device 1
An identification information area 31 in which identification information unique to 0 is stored,
A recording data area 32 for temporarily storing data to be recorded on the disc and an encryption program area 33 for storing an encryption program for performing encryption processing of identification information are provided.

The identification information stored in the identification information area 31 is unique to the disk device 10 and is composed of, for example, a combination of three pieces of information of a vendor ID, a product ID and a serial number. The vendor ID is a code of the manufacturer of the disk device, the product ID is a code assigned to each model number of the disk device, and the serial number is a code assigned to each disk device. The same code may be assigned to different disk devices as the vendor ID and the product ID, but the serial number is different for each disk device, and the same serial number does not exist between different disk devices. Therefore, it is possible to omit the vendor ID and the product ID and configure the identification information only with the serial number.

The data stored in the recording data area 32 is data created in a host device such as a PC, transferred to the disk device 10 via the interface 5, and stored in the recording data area 32 of the memory 3. It The encryption program stored in the encryption program area 33 is composed of an encryption program for encrypting the identification information and a decryption program for decrypting the encrypted identification information.

Next, the disk device 10 having the above structure
The operation of will be described. First, FIG. 3 shows the operation during recording.
And it demonstrates with reference to FIG. In FIG. 3, 10A
Is a disk device having the above-described configuration of the disk 10 (hereinafter, the disk device 10A is referred to as "drive A"), 11A is a disk insertion port of the drive A, and 20A is a CD-R or CD-set to the drive A. It is a disc such as RW (hereinafter, disc 20A is referred to as "disc a").
Note). When data is recorded on the disk a, the data shown in FIG.
As shown in (a), the disc a is inserted into the disc insertion opening 11A of the drive A, and the data stored in the recording data area 32 of the memory 3 is recorded on the disc a by the disc writing unit 2 (FIG. 1). To do. At this time, the identification information (denoted as α) unique to the drive A stored in the identification information area 31 of the memory 3 is also recorded on the disc a. Figure 7
Shows the structure of the recording area on the disc,
The above-mentioned data is recorded in the data area, and the identification information α is recorded in the identification information area using the empty area in the lead-in area. The identification information α can be recorded in the TOC information area in the PMA area, the lead-out area, or the lead-in area.
Thus, the disc a on which the identification information α is recorded together with the data is ejected from the disc insertion opening 11A of the drive A as shown in FIG. 3B.

FIG. 4 shows a case where data is recorded on the disc by a device different from the drive A. In FIG. 4, 10B is a disk device having the above-described configuration of the disk 10 (hereinafter, the disk device 10B is referred to as “drive B”).
11B is the disk insertion slot of drive B, 20
B is a disc such as a CD-R or a CD-RW set in the drive B (hereinafter, the disc 20B is referred to as "disc b"). When recording data on disc b,
As shown in FIG. 4A, the disk insertion opening 11 of the drive B
The disc b is inserted into B, and the disc writing unit 2 (FIG. 1) records the data stored in the recording data area 32 of the memory 3 on the disc b. At this time, the identification information (denoted by β) unique to the drive B stored in the identification information area 31 of the memory 3 is also recorded on the disc b.
The structure of the recording area of the disc b is the same as that of FIG. 7, data is recorded in the data area, and the identification information β is recorded in the lead-in area (may be the PMA area or the lead-out area). In this way, the disc b on which the identification information β is recorded together with the data is ejected from the disc insertion opening 11B of the drive B as shown in FIG. 4B. The identification information β recorded on the disc b is different from the identification information α recorded on the disc a.

Next, the operation of reading the disc will be described with reference to FIGS. In FIG. 5, when the disc a is inserted into the drive A for reproduction as shown in FIG. 5A, the identification information stored in the memory 3 of the drive A and the identification information read from the disc a are both α. , The drive A reads the data recorded on the disk a. Also,
Even when the disc b is inserted into the drive B for reproduction as shown in (b), the identification information stored in the memory 3 of the drive B and the identification information read from the disc b both match at β. , Drive B reads the data recorded on disc b.

On the other hand, when the disc b is inserted into the drive A for reproduction as shown in FIG. 6A, the identification information stored in the memory 3 of the drive A is α, whereas
The identification information read from the disc b is β, and the two do not match. Therefore, the drive A determines that the disc b is not the disc on which the data is recorded by the drive A, and stops reading the data recorded on the disc b. Also, when the disc a is inserted into the drive B for reproduction as shown in FIG. 6B, the identification information stored in the memory 3 of the drive B is β, but the disc a is read from the disc a. The identification information is α, and the two do not match. Therefore, the drive B determines that the disc a is not the disc on which the data is recorded by the drive B,
The reading of the data recorded on the disk a is stopped.

Thus, by checking the identification information recorded together with the data at the time of reproduction, it is prohibited to read the disc data by a device other than the disc device used for the data recording, and only by the disc device used for the data recording. It is allowed to read the data on the disc.

FIGS. 8 and 9 are flowcharts showing the operation of the disk device described above, showing the procedure of the access restriction method according to the present invention. FIG. 8 shows a recording procedure, and FIG. 9 shows a reading (reproducing) procedure. These procedures are executed by the control unit 6.

First, the procedure for recording will be described with reference to FIG. When the disc is inserted into the disc device 10 (step S1) and a predetermined recording operation is performed on the host side, the data stored in the recording data area 32 of the memory 3 by the disc writing unit 2 becomes the data area of the disc. It is recorded in (FIG. 7) (step S2). Subsequently, the disc writing unit 2 causes the identification information area 3 of the memory 3 to be displayed.
The identification information stored in No. 1 is recorded in the lead-in area of the disc (step S3). At this time, the identification information is encrypted according to the encryption program in the encryption program area 33 and recorded on the disc. The data in the recording data area 32 is recorded on the disc as it is without being encrypted. After that, the recording operation is completed after waiting for the disc to be ejected (step S4).

Next, the reading procedure will be described with reference to FIG. When the disc is inserted into the disc device 10 (step S11) and a predetermined reading operation is performed on the host side, the disc reading unit 1 first reads the identification information recorded in the lead-in area of the disc (step S12). ). Next, the read identification information is decoded by the decoding program, and the identification information is stored in the memory 3
It is determined whether or not it matches the identification information stored in the identification information area 31 (step S13). If the identification information matches as a result of the determination (step S13:
Y), the reading of the data of the disc is permitted, and the data recorded in the data area of the disc is read by the disc reading unit 1 (step S14). On the other hand, as a result of the determination, when the identification information does not match (step S13: N), reading the data of the disc is prohibited, and the disc reading unit 1 stops the reading of the data (step S15). At this time, on the host side, for example, on the monitor screen of the PC, a message indicating that the data on the disk cannot be read is displayed.

According to the above-described embodiment, after the disc owner records data on the disc with his / her PC,
Even if the disc is handed over to a third party and the disc is played back on the third party's PC, the data cannot be read from the disc because the identification information does not match, and the disc security can be ensured. . The identification information is automatically recorded when the data is recorded on the disc, and when the disc is read, the identification information is automatically collated to permit or prohibit the reading of the data. As described above, the operation of setting a password and inputting it each time access is completely unnecessary, and the problem of inaccessibility due to forgetting the password does not occur.

FIGS. 10 and 11 are flowcharts showing another embodiment of the present invention, which is an example in which the reading of data from the disk is restricted only when necessary. FIG. 10 shows the procedure at the time of recording, and FIG. 11 shows the procedure at the time of reading (at the time of reproduction). These procedures are executed by the control unit 6.

First, the procedure for recording will be described with reference to FIG. When the disc is inserted into the disc device 10 (step S21) and a predetermined recording operation is performed on the host side, the data stored in the recording data area 32 of the memory 3 by the disc writing unit 2 becomes the data area of the disc. It is recorded in (FIG. 7) (step S22). Next, it is determined whether or not this recorded data is data that cannot be read by another disk device, that is, whether or not access restriction is necessary (step S23). Whether or not access restriction is required is specified on the host side, for example, on the setting screen shown in FIG. 12 displayed on the monitor of the PC. The result of this designation is sent to the control unit 6 via the interface 5 as a command, and the control unit 6 determines whether or not access restriction is required based on this command.

As a result of the judgment, if access restriction is required (step S23: Y), the disc writing unit 2
The identification information stored in the identification information area 31 of the memory 3 is recorded in the lead-in area of the disc (step S24). At this time, the identification information is encrypted according to the encryption program in the encryption program area 33 and recorded on the disc. The data in the recording data area 32 is recorded on the disc as it is without being encrypted.
After that, wait until the disc is ejected (step S
25), the recording operation ends. On the other hand, if access restriction is not required (step S23: N), the disc is ejected without recording the identification information (step S25), and the recording operation is ended.

Next, the procedure for reading will be described with reference to FIG. When the disc is inserted into the disc device 10 (step S31) and a predetermined reading operation is performed on the host side, the disc reading unit 1 first reads the lead-in area of the disc (step S32).
It is determined whether or not the identification information is recorded in the lead-in area (step S33). If the identification information is recorded (step S33: Y), the read identification information is decrypted by the decryption program, and whether the identification information matches the identification information stored in the identification information area 31 of the memory 3 or not. It is determined whether or not (step S34). As a result of the determination, if the identification information matches (step S34:
Y), the reading of the data of the disc is permitted, and the data recorded in the data area of the disc is read by the disc reading unit 1 (step S35). On the other hand, as a result of the determination, when the identification information does not match (step S34: N), reading the data of the disc is prohibited, and the disc reading unit 1 stops the reading of the data (step S36). Again, on the host side,
For example, on the monitor screen of the PC, a message indicating that the disc data cannot be read is displayed.

As described above, by selecting the access restriction to the disc, for example, for a disc on which security-required data is recorded, identification information is recorded and read by another disc device. On the other hand, for a disc on which data that does not require security is recorded, reproduction can be performed on another disc device without recording identification information.
In addition, even if the disc contains security-required data, if the disc owner owns multiple PCs, the discs can be read by each PC without recording the identification information. You can also

Further, in this embodiment, since the identification information is encrypted and recorded, the security is improved. In order to read the data on the disc, it is premised that the identification information is the same, so if the identification information cannot be decoded, the data cannot be read. Therefore,
If only the identification information is encrypted, the data will be protected automatically, so it is not necessary to encrypt the data itself. Therefore, the encryption and decryption processing becomes simple.

In the above embodiments, an optical disk such as a CD-R or a CD-RW is taken as an example of the disk, but the present invention is not limited to a disk device for an optical disk, and a magnetic disk or an optical disk. It can also be applied to a disk device that handles a magnetic disk.

[0030]

According to the present invention, the identification information unique to the disc device is recorded on the disc, so that access to the disc can be restricted very easily without using a password.

[Brief description of drawings]

FIG. 1 is a schematic block diagram of a disk device according to the present invention.

FIG. 2 is a table showing a part of the stored contents of a memory.

FIG. 3 is a diagram illustrating an operation during recording.

FIG. 4 is a diagram illustrating an operation during recording.

FIG. 5 is a diagram illustrating an operation at the time of reading.

FIG. 6 is a diagram illustrating an operation at the time of reading.

FIG. 7 is a diagram showing a configuration of a recording area on a disc.

FIG. 8 is a flowchart showing an operation during recording.

FIG. 9 is a flowchart showing an operation at the time of reading.

FIG. 10 is a flowchart showing an operation at the time of recording in another embodiment.

FIG. 11 is a flowchart showing an operation at the time of reading in another embodiment.

FIG. 12 is an example of a screen for setting access restrictions.

[Explanation of symbols]

1 Disc reader 2 Disc writing section 3 memory 6 control unit 10 disk device 10A disk device 10B disk device 31 Identification information area 32 recorded data area 33 Cryptographic program area 20A disc 20B disc α identification information β identification information

Claims (5)

[Claims] 1. A disc reading unit for reading information recorded on a disc, a disc writing unit for recording information on the disc, a memory for storing information to be recorded on the disc, and a control for reading and writing information on the disc. In the disk device including a control unit for controlling the disk device, identification information unique to the disk device is stored in the memory, and when the disk writing unit records data on the disk, the data is stored in another disk device. When the data is prohibited to read, the identification information is recorded in a predetermined area of the disc, and when the disc reading unit reads the data from the disc, when the identification information is recorded on the disc,
The control unit reads the identification information, the control unit compares the identification information read by the disc reading unit with the identification information stored in the memory, and if the two match, the disc reading unit reads the data from the disc. A disk device that permits reading and prohibits reading of data from the disk by the disk reading unit when the two do not match. 2. A disc device for recording information on a disc and reading the information recorded on the disc. When recording data on the disc, identification information peculiar to the disc device is recorded on the disc, and data is recorded from the disc. When reading, read the identification information recorded on the disc, and if this identification information matches the identification information of the disc device, read the data from the disc; otherwise, read the data from the disc. A disk device characterized by prohibiting reading. 3. The disk device according to claim 2, wherein it is determined whether the data to be recorded on the disk is data that is prohibited to be read by another disk device, and if the data is not to be read. A disc device, wherein the identification information is recorded on a disc, and the identification information is not recorded on the disc if the data is not prohibited to be read. 4. The disk device according to claim 2 or 3, wherein, of the data and the identification information to be recorded on the disk, only the identification information is encrypted and recorded. 5. A method for restricting data recorded on a disc by a disc device from being read by another disc device, wherein when recording data on the disc, identification information unique to the disc device is given to the disc. When recording data in the area and reading the data from the disc, the identification information recorded on the disc is read, and if the read identification information matches the identification information stored in the disc device, the data is read from the disc. A method of restricting access to a disk, which prohibits reading of data from the disk when both do not match.