Anti-counterfeit compact disc

Details Anti-counterfeit compact disc Anti-counterfeit compact disc

1999-01-13

2001-03-27

Huber, Paul W. (Department: 2651)

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

For copying

C369S124050, C369S124070

Reexamination Certificate

active

06208598

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to compact disc technology in general, and in particular to methods and apparatus for recording audio data onto a compact disc (CD) so as to discourage unauthorized duplication thereof.
BACKGROUND OF THE INVENTION
Measures currently known or proposed in the art for preventing the unauthorized duplication of compact discs are generally limited to marking compact discs in order to identify a counterfeit copy and trace it back to its point of origin. The primary disadvantage of such measures is that they provide no technical deterrent to duplicating compact discs.
The disclosures of all publications mentioned in this specification and of the publications cited therein are hereby incorporated by reference.
SUMMARY OF THE INVENTION
The present invention seeks to provide novel methods and apparatus for recording audio data onto a compact disc so as to discourage unauthorized duplication thereof which overcomes the known disadvantage of the prior art as discussed above.
There is thus provided in accordance with a preferred embodiment of the present invention a method for recording audio data onto a compact disc so as to discourage unauthorized copying thereof, the method including sampling a source audio data stream to determine at least one source audio data portion thereof the a derivative function of a sequence of samples of the source audio data portion is substantially constant, modifying the source audio data stream by substituting the source audio data portion with a substitute audio data portion, recording the modified audio data stream into at least one frame of the compact disc the frame has a P-channel, and setting the value of the P-channel that corresponds to the substitute audio data portion to 1.
Further in accordance with a preferred embodiment of the present invention the modifying step includes creating the substitute audio data portion by altering the original audio data portion.
Still further in accordance with a preferred embodiment of the present invention the modifying step includes altering the original audio data portion by adding a fullscale complement to the original audio data portion.
There is also provided in accordance with a preferred embodiment of the present invention a compact disc including at least one frame including modified audio data derived from a source audio data stream having at least one source audio data portion thereof the a derivative function of a sequence of samples of the source audio data portion is substantially constant and the source audio data stream has been modified by substituting the source audio data portion with a substitute audio data portion, and a P-channel that corresponds to the substitute audio data portion the P-channel has a value of 1.
There is additionally provided in accordance with a preferred embodiment of the present invention apparatus for preparing audio data prior to being recording onto a compact disc so as to discourage unauthorized copying thereof including intercept apparatus operative to sample a source audio data stream to determine at least one source audio data portion thereof the a derivative function of a sequence of samples of the source audio data portion is substantially constant, modify the source audio data stream by substituting the source audio data portion with a substitute audio data portion, and set a P-channel of a frame of the compact disc into which the substitute audio data portion is to be recorded to 1.


REFERENCES:
“Compact Disc Digital Audio System”, International Electrotechnical Commission, International Standard, First Edition, 1987.
“CD-ROM and its Technology”, No. 36, pp. 559-600.
“Information Technology—Data Interchange on Read-Only 120 mm Optical Data Disks (CD-ROM)”, International Standard, ISO/IEC 10149, Second Edition. (1995).

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