Optical disk and method of preventing fraudulent use of optical disk rotation synchronous control system

• US 5,684,785 A
• Filed: 11/01/1995
• Issued: 11/04/1997
• Est. Priority Date: 06/07/1993
• Status: Expired due to Fees

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Fujitsu Limited
• Inventors: Komura, Satoshi, Itami, Satoshi, Utsumi, Kenichi, Nakashima, Kazuo, Naito, Kazunori
• Primary Examiner(s): DINH, TAN X
• Application Number:
  US08/551,577
• Time in Patent Office: 734 Days
• Field of Search: 369/32, 369/84, 369/47, 369/48, 369/54, 369/56, 369/58, 369/57, 369/275.1, 369/275.2, 369/275.3, 369/14, 369/15, 369/124, 369/273, 360/60, 430/10, 380/3, 380/4, 380/5, 386/126, 386/94
• US Class Current: 369/275.2
• CPC Class Codes: G11B 23/36 Signals on record carriers or on containers and recorded by the same method as the main recording

Abstract

A method of preventing a fraudulent use of an optical disk having a read-write region and a read-only region, comprising the steps of: writing data for designating the boundary between the read-write region and the read-only region into a predetermined block of the optical disk; reading the data out of the predetermined block prior to the execution of the software recorded on an optical disk as an object of fraudulent use check; reading data out of a block which is assumed to be in the read-only region by reference to the data read out of the predetermined block, and writing the data read out of the block in the assumed read-only region into the same block; reading data out of a block which is assumed to be in the read-write region by reference to the data read out of the predetermined block, and writing the data read out of the block in the assumed read-write region into the same block; and judging that the optical disk as an object of fraudulent use check is not a fraudulent copy when the data writing operation is impossible in the block in the assumed read-only region but possible in the block in the assumed read-write region.

Claims

1. An optical disk comprising:

a plurality of rewritable blocks defining a read-write region;

a plurality of read-only blocks defining a read-only region; and

a boundary data block located in said read-only region for storing boundary data indicative of the boundary between said read-write region and said read-only region.

2. An optical disk according to claim 1, further comprising:

an address data block for storing address data indicative of the address of said boundary data block.

3. An optical disk according to claim 2, wherein said address data block is located in said read-write region.

4. A method of preventing fraudulent use of optical disks having a plurality of rewritable blocks defining a read-write region, a plurality of read-only blocks defining a read-only region and a boundary data block for storing boundary data indicative of a boundary between said read-write region and said read-only region, comprising the steps of:

(a) reading, from an optical disk, the boundary data from the boundary data block prior to the execution of software recorded on the optical disk;

(b) reading data from a read-only block which is in the read-only region indicated by the boundary data, and attempting writing of the data read from the read-only block in the read-only region back into the read-only block;

(c) reading data from a read-write block which is in the read-write region indicated by the boundary data and attempting writing of the data read from the read-write block in the read-write region back into the read-write block; and

(d) judging that said optical disk is not a fraudulent use when the attempted data writing operation of said step (b) is impossible and the attempted data writing operation of step (c) is possible.

5. A method of preventing a fraudulent use of an optical disk according to claim 4, further comprising a step of judging that said optical disk is a fraudulent use when said attempted writing operation of the step (b) is possible.

6. A method of preventing a fraudulent use of an optical disk according to claim 4, further comprising a step of judging that said optical disk is write-protected when both of said attempted writing operations of the steps (b) and (c) are impossible.

7. A method of preventing a fraudulent use of an optical disk according to claim 6, further comprising a step of warning a user of said optical disk of the write protection when said optical disk is judged to be write-protected.

8. A method of preventing a fraudulent use of an optical disk according to claim 4, further comprising the steps of:

writing data indicative the address of the boundary data block into a predetermined block of said optical disk; and

recognizing the boundary data block by said data indicative of the address of the boundary data block.

9. A method of preventing a fraudulent use of an optical disk according to claim 4, wherein the boundary data block is provided in said read-only region.

10. An optical disk comprising:

a plurality of rewritable blocks defining a read-write region;

a plurality of read-only blocks defining a read-only region;

a boundary data block located in said read-only region for storing boundary data indicative of a boundary between said read-write region and said read-only region; and

an address data block for storing address data indicative the address of said boundary data block,

wherein the address data is a number N when the boundary data block is N blocks distant from the last block of an accessible region of the optical disk.

11. A method for use with an optical disk having a plurality of rewritable blocks defining a read-write region and a plurality of read-only blocks defining a read-only region, a boundary data block for storing boundary data indicative of a boundary between said read-write region and said read-only region;

and

check program blocks for storing a check program;

the method comprising the steps of;

(a-1) reading the check program from the check program blocks; and

in accordance with the check program,

(a-2) reading the boundary data from the boundary data block prior to execution of software recorded on the optical disk;

(b) reading data from a read-only block which is in the read-only region indicated by the boundary data, and attempting writing of the data read from the read-only block in the read-only region back into the read-only block;

(c) reading data from a read-write block which is in the read-write region indicated by the boundary data and attempting writing of the data read from the read-write block in the read-write region back into the read-write block; and

(d) judging that the optical disk is not a fraudulent use when the attempted data writing operation of said step (b) is impossible and the attempted data writing operation of said step (c) is possible.

12. A method according to claim 11 further comprising the step of, of:

(e) allowing the said software to be executed when the optical disk is not a fraudulent use.

13. A method according to claim 12, further comprising the steps of:

(f) judging in accordance with the check program that the optical disk is a fraudulent use when the attempted data writing operation of said step (b) is possible; and

(g) inhibiting the software from being executed when the optical disk is a fraudulent use.

14. A method according to claim 13, further comprising:

a step (h) of judging in accordance with the check program that said optical disk is write-protected when said attempted operation of the steps (b) and (c) are impossible both in said read-only block in the read-only region and in said read-write block in the read-write region.

15. A method for use with an optical disk having a plurality of rewritable blocks defining a read-write region, a plurality of read-only blocks defining a read-only region, and a boundary data block for storing boundary data indicative of a boundary between said read-write region and said read-only region, the method comprising the steps of:

(a) reading, from the optical disk, the boundary data from the boundary data block prior to the execution of software recorded on the optical disk;

(b) reading data from a read-only block which is in the read-only region indicated by the boundary data, and attempting writing of the data read from the read-only block in the read-only region back into the read-only block; and

(c) judging that said optical disk is not a fraudulent use when the attempted data writing operation of said step (b) is impossible and that said optical disk is a fraudulent use when the attempted data writing operation of said step (b) is possible.

16. A method for use with an optical disk according to claim 15, wherein the optical disk is write unprotected.

17. An optical disk comprising;

a plurality of rewritable blocks defining a read-write region;

a plurality of read-only blocks defining a read-only region;

a boundary data block for storing boundary data indicative of a boundary between said read-write region and said read-only region; and

check program blocks for storing a check program for (a) reading the boundary data from the boundary data block, (b) reading data from a read-only block which is in the read-only region indicated by the boundary data, and attempting writing of the data read from the read-only block in the read-only region back into the read-only block, and (c) judging that said optical disk is not a fraudulent use when the attempted data writing operation of (b) is impossible, and that said optical disk is a fraudulent use when the attempted data writing operation of (b) is possible.

18. An optical disk comprising;

a plurality of rewritable blocks defining a read-write region;

a plurality of read-only blocks defining a read-only region;

a boundary data block for storing boundary data indicative of a boundary between said read-write region and said read-only region; and

check program blocks for storing a check program for (a) reading the boundary data from the boundary data block, (b) reading data from a read-only block which is in the read-only region indicated by the boundary data, and attempting writing of the data read from the read-only block in the read-only region back into the read-only block, (c) reading data from a read-write block which is in the read-write region indicated by the boundary data and attempting writing of the data read from the read-write block in the read-write region back into the read-write block, and (d) judging that said optical disk is not a fraudulent use when the attempted data writing operation of (b) is impossible and the attempted data writing operation of (c) is possible, and that said optical disk is a fraudulent use when the attempted data writing operation of (b) is possible.

19. A system having an optical disk drive for reading and writing data from and to an optical disk and a host apparatus for executing prescribed processing in accordance with software recorded on the optical disk, the optical disk having a plurality of rewritable blocks defining a read-write region, a plurality of read-only blocks defining a read-only region and a boundary data block for storing boundary data indicative of a boundary between said read-write region and said read-only region, said system comprising:

(a) boundary data read means for causing the optical disk drive to read the boundary data from the boundary data block;

(b) read-only data read-write means for causing the optical disk drive to read data from a read-only block which is in the read-only region indicated by the boundary data and for attempting writing of the data read from the read-only block in the read-only region back into the read-only block;

(c) read-write data read means for causing the optical disk drive to read data from read-write block which is in the read-write region indicated by the boundary data and for attempting writing of the data read from the read-write block in the read-write region back into the read-write block; and

(d) judging means for judging that said optical disk is not a fraudulent use when the data writing operation attempted by said read-only data read-write means is impossible, and the data writing operation attempted by said read-write data read means is possible, and that said optical disk is a fraudulent use when the data writing operation attempted by said read-only data read-write means is possible.

20. A system having an optical disk drive for reading and writing data from and to an optical disk and a host apparatus for executing prescribed processing in accordance with software recorded on the optical disk, the optical disk having a plurality of rewritable blocks defining a read-write region, a plurality of read-only blocks defining a read-only region, a boundary data block for storing boundary data indicative of a boundary between said read-write region and said read-only region and check program blocks for storing a check program, said system comprising:

check program read means for causing the optical disk drive to read the check program from the check program blocks; and

check program execution means for

(a) reading the boundary data from the boundary data block;

(b) reading data from a read-only block which is in the read-only region indicated by the boundary data and attempting writing of the data read from the read-only block in the read-only region back into the read-only block;

(c) reading data from a read-write block which is in the read-write region indicated by the boundary data and attempting writing of the data read from the read-write block in the read-write region back into the read-write block; and

(d) judging that said optical disk is not a fraudulent use when attempted data writing operation of (b) is impossible and the attempted data writing operation of (c) is possible, and that said optical disk is a fraudulent use when the attempted data writing operation of (b) is possible.

21. A system having an optical disk drive for reading and writing data from and to an optical disk and a host apparatus for executing prescribed processing in accordance with software recorded on the optical disk, the optical disk having a plurality of rewritable blocks defining a read-write region, a plurality of read-only blocks defining a read-only region, and a boundary data block for storing boundary data indicative of a boundary between said read-write region and said read-only region, said system comprising:

(a) boundary data read means for causing the optical disk drive to read the boundary data from the boundary data block;

(b) read-only data read-write means for causing the optical disk drive to read data from a read-only block which is in the read-only region indicated by the boundary data and attempting writing of the data read from the read-only block in the read-only region back into the read-only block;

(c) means for judging that said optical disk is not a fraudulent use when the data writing operation attempted by said read-only data read-write means is impossible, and that said optical disk is a fraudulent use when the data writing operation attempted by said read-only data read-write means is possible.

22. A method of using optical disks each having a plurality of rewritable blocks defining a read-write region, a plurality of read-only blocks defining a read-only region, a boundary data block for storing boundary data indicative of a boundary between said read-write region and said read-only region, and operating programs blocks for storing an operating program, said method comprising:

(a-1) copying an operating program from one optical disk onto another optical disk to produce an optical disk having various operating programs;

(a-2) reading, from said another optical disk, boundary data from the boundary data block prior to the execution of one of the various operating programs recorded on said optical disk;

(b) reading data from a read-only block which is in the read-only region indicated by the boundary data, and attempting writing of the data read from the read-only block in the read-only region back into the read-only block;

(c) judging that said optical disk is not a fraudulent use when the attempted data writing operation of said step (b) is impossible and that said optical disk is a fraudulent use when the attempted data writing operation of said step (b) is possible; and

(d) allowing the operating program to be executed when the optical disk is not a fraudulent use and inhibiting the operating program from being executed when the optical disk is a fraudulent use.