# US 7,411,877 B2 · Dislike recording media, a method for detecting forged disks, an anti-forgery system for performing a true-false judgment based on information collected from the recording media, and a manufacturing apparatus for recording information in the disks

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- Number: US 7,411,877 B2
- Document ID: US7411877B2
- Status: Granted
- Kind: B2
- Application number: 11/433,871
- Filed: 2006-05-13
- Published: 2006-09-28
- Granted: 2008-08-12
- Earliest claimed: 1998-03-10
- Assignees: Victor Company of Japan, Ltd.
- Inventors: Tetsuya Kondo
- Web page: https://patentgrep.com/patent/US7411877B2

## CPC

- G11B 23/284: {on the record carrier}
- 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)}
- G11B 7/24094: Indication parts or information parts for identification
- G11B 7/26: Apparatus or processes specially adapted for the manufacture of record carriers
- G11B 19/12: by sensing distinguishing features of {or on} records, e.g. diameter {end mark}
- 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)}
- G11B 20/00094: {involving measures which result in a restriction to authorised record carriers}
- 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}
- G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R)

## 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

### Claim 1

A playback and communication system, comprising:
a playback device for reading information stored in a predetermined region of an information recording medium by using an optical pickup device; and
a communication device for establishing a communication line between said playback device and an external device to transmit the information read out by said playback device to said external device via said communication line,
wherein the communication device is adapted to receive an answer signal transmitted from the external device, and to transmit the answer signal to the playback device; and
wherein the playback device is adapted to read out information from a region other than the predetermined region of the information recording medium, based on the answer signal.

### Claim 2

An information processing system, comprising:
a receiving device for receiving first information via a communication line from an apparatus which includes a playback device for reading said first information from a predetermined region of an information recording medium by using an optical pickup device;
a communication device for establishing said communication line;
a processor for processing second information indicating reading out of information from a region other than the predetermined region of the information recording medium, on the basis of the first information received by said receiving device; and
a transmitting device for outputting the second information processed by said processor.

### Claim 3 (depends on 2)

The information processing system according to claim 2, wherein
the transmitting device is adapted to output the second information to the playback device via the communication device; and
the playback device is adapted to read out the information from the region other than the predetermined region of the information recording medium, on the basis of the second information.