DISKLIKE RECORDING MEDIA, A METHOD FOR DETECTING FORGED DISKS, AN ANTI-FORGERY SYSTEM FOR PERFORMING A TRUE-FALSE JUDGEMENT BASED ON INFORMATION COLLECTED FROM THE RECORDING MEDIA, AND A MANUFACTURING APPARATUS FOR RECORDING INFORMATION IN THE DISKS

• US 6,363,043 B1
• Filed: 03/08/1999
• Issued: 03/26/2002
• Est. Priority Date: 03/10/1998
• Status: Expired due to Fees

• Current Assignee: JVC Kenwood Corporation
• Original Assignee: Victor Company of Japan Limited (JVC Kenwood Corporation)
• Inventors: Kondo, Tetsuya
• Primary Examiner(s): EDUN, MUHAMMAD N
• Application Number:
  US09/264,540
• Time in Patent Office: 1,114 Days
• Field of Search: 369/47, 369/48, 369/49, 369/50, 369/54, 369/58, 369/59, 369/83, 369/84, 369/47.1, 369/47.11, 369/47.15, 369/53.1, 369/53.11, 369/53.15, 369/53.2, 369/53.21, 369/53.22, 369/54.44, 369/59.1, 369/275.1
• US Class Current: 369/53.21
• CPC Class Codes: G11B 19/12 by sensing distinguishing features of or on records, e.g. diameter end mark
• CPC Class Codes: G11B 20/00086 Circuits for prevention of unauthorised reproduction or copying, e.g. piracy indicating unauthorised use of record carriers in general G11B23/28; scrambling for television signal recording H04N5/913; network architectures or network protocols for network security H04L63/00; cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
• CPC Class Codes: G11B 20/00094 involving measures which result in a restriction to authorised record carriers
• CPC Class Codes: G11B 20/00173 wherein the origin of the content is checked, e.g. determining whether the content has originally been retrieved from a legal disc copy or another trusted source
• CPC Class Codes: G11B 23/284 on the record carrier
• CPC Class Codes: G11B 7/00736 Auxiliary data, e.g. lead-in, lead-out, Power Calibration Area [PCA], Burst Cutting Area [BCA], control information sector headers or adresses in prepits G11B7/00745; address data in track wobble G11B7/24082
• CPC Class Codes: G11B 7/24094 Indication parts or information parts for identification
• CPC Class Codes: G11B 7/26 Apparatus or processes specially adapted for the manufacture of record carriers

Abstract

A recording medium includes first information selected from a plurality of information patterns and second information selected from another plurality of information patterns for the true-false judgement. A true-false judging device performs a statistic analysis when any coincidence is found between the readout combination of the first and second information and registered combination patterns, to identify an inspected recording medium as a forged product based on the result of the statistic analysis.

Claims

1. A recording medium in which ordinary information is stored with said ordinary information being irrelevant when performing a true-false judgement to identify a forged product comprising:

first information stored in said recording medium selected from a first group of true-false judgement patterns prepared beforehand; and

second information stored in said recording medium selected from a second group of true-false judgement patterns prepared beforehand;

wherein a combination of said first information and said second information is necessary for performing a true-false judgement to identify a forged product.

2. A recording medium comprising a disklike body having a first surface on which first information is recorded and a second surface on which second information is recorded wherein

said first information is selected from a group of true-false judgement patterns prepared beforehand;

and

said second information is selected from a second group of true-false judgement patterns prepared beforehand with said first information and second information being stored such that a combination of said first information and said second information is needed to perform a true-false judgement to identify a forged product.

3. The recording medium in accordance with claim 2, wherein said first information is a pit or groove pattern formed on said first surface.

4. The recording medium in accordance with claim 2, wherein a registered combination pattern of an enciphered format is recorded on a specific area of a disk surface other than said first information and said second information.

5. A recording medium for storing first information selected from a first group of true-false judgement patterns prepared beforehand and for storing second information selected from a second group of true-false judgement patterns prepared beforehand with said first information and second information being stored such that a true-false judgement identifying a forged product is performed based on a combination of said first information and said second information, and

wherein said first information and said second information are independent of each other and selected randomly.

6. A system for detecting forged products of recording media, said system comprising:

reading means for reading first information and second information from an inspected recording medium, said first and second information being discriminable from ordinary information which is irrelevant to a true-false judgement performed for identifying a forged product, said first information being selected from a first group of true-false judgement patterns prepared beforehand, and said second information being selected from a second group of true-false judgement patterns prepared beforehand;

memory means for storing a plurality of true combination patterns corresponding to the combination of said first group of true-false judgement patterns and said second group of true false judgement patterns; and

true-false judging means for identifying said inspected recording medium as a forged product when no coincidence is found between a readout combination of said first and second information and said true combination patterns.

7. The system in accordance with claim 6, wherein said true-false judging means is for further performing a statistic analysis when any coincidence is found between said readout combination and said registered combination patterns, thereby identifying said inspected recording medium as a forged product based on the result of the statistic analysis.

8. The system in accordance with claim 7, wherein said true-false judging means is for detecting a combination pattern of said first and second information recorded on the forged product with reference to a standard deviation in said statistic analysis.

9. The system in accordance with claim 7, wherein said true-false judging means is for detecting a combination pattern of said first and second information recorded on the forged product with reference to a time differential value of a standard deviation in said statistic analysis.

10. An apparatus for detecting forged products of recording media, said apparatus comprising:

reading means for reading first information and second information from an inspected recording medium;

said first and second information being discriminable from ordinary information which is irrelevant to a true-false judgement preformed for identifying a forged product, said first information being selected from a first group of true-false judgement patterns prepared beforehand, and said second information being selected from a second group of true-false judgement patterns prepared beforehand;

transmitting means for transmitting a readout of a combination of said first and second information to a true-false judging apparatus which identifies a forged product;

receiving means for receiving a true-false judgement result from said true-false apparatus; and

output means for outputting said true-false judgement result.

11. The apparatus in accordance with claim 10, wherein said readout combination of said first and second information is transmitted to said true-false judging apparatus by using a communication device and related communication software.

12. The apparatus in accordance with claim 10, wherein said apparatus is a playback apparatus of a disklike recording medium.

13. An apparatus for detecting forged products of recording media, said apparatus comprising:

memory means for storing a plurality of true combination patterns which are predetermined beforehand for a true-false judgment performed for identifying a forged product;

receiving means for receiving a combination of first and second information read out from an inspected recording medium, said first and second information being discriminable from ordinary information which is irrelevant to a true-false judgement, said first information being selected from a first group of true-false judgment patterns prepared beforehand, and said second information being selected from a second group of true-false judgement patterns prepared beforehand; and

true-false judging means for identifying said inspected recording medium as a forged product when no coincidence is found between the readout combination of said first and second information and said true combination patterns.

14. The apparatus in accordance with claim 13, wherein said true-false judging means is for further performing a statistic analysis when any coincidence is found between said readout combination and said registered combination patterns, thereby identifying said inspected recording medium as a forged product based on the result of the statistic analysis.

15. The apparatus in accordance with claim 14, wherein said true-false judging means is for detecting a combination pattern of said first and second information recorded on the forged product with reference to a standard deviation in said statistic analysis.

16. The apparatus in accordance with claim 14, wherein said true-false judging means is for detecting a combination pattern of said first and second information recorded on the forged product with reference to as time differential value of a standard deviation in said statistic analysis.

17. A manufacturing apparatus for a disklike recording medium, said manufacturing apparatus comprising:

first recording means for recording ordinary information which is irrelevant to a true-false judgement performed for identifying a forged product including first information on a first surface of the disklike recording medium, said first information being selected from a plurality of information patterns for a true-false judgement; and

second recording means for recording first information on a first surface of the disklike recording medium, said first information being selected from first group of true-false judgement patterns prepared beforehand and third recording means for recording second information on a second surface of the disklike recording medium, said second information being selected from second group of true-false judgement patterns prepared beforehand, so that said true-false judgement can be performed based on a combination of said first information and said second information.