Anti-counterfeit compact disc
AssigneeMidbar Tech (1998) Ltd.
InventorsPatrice Sinquin, Philippe Selve, Ran Alcalay
Life of this patent
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Abstract
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.
Claims5
A compact disc comprising:
- at least one frame comprising:
- modified audio data derived from a source audio data stream having at least one source audio data portion thereof wherein a derivative function of a sequence of samples of said source audio data portion is substantially constant and wherein said source audio data stream has been modified by substituting said source audio data portion with a substitute audio data portion;
- and
- a P-channel that corresponds to said substitute audio data portion wherein the P-channel has a value of 1.
Apparatus for preparing audio data prior to being recording onto a compact disc so as to discourage unauthorized copying thereof comprising:
- intercept apparatus operative to sample a source audio data stream to determine at least one source audio data portion thereof wherein a derivative function of a sequence of samples of said source audio data portion is substantially constant, modify said source audio data stream by substituting said source audio data portion with a substitute audio data portion, and set a P-channel of a frame of said compact disc into which said substitute audio data portion is to be recorded to 1.
A method for recording audio data onto a compact disc so as to discourage unauthorized copying thereof, the method comprising:
- sampling a source audio data stream to determine at least one source audio data portion thereof wherein a derivative function of a sequence of samples of said source audio data portion is substantially constant;
- modifying said source audio data stream by substituting said source audio data portion with a substitute audio data portion;
- recording said modified audio data stream into at least one frame of said compact disc wherein said frame has a P-channel;
- and
- setting the value of said P-channel that corresponds to said substitute audio data portion to 1.
Dependencies are inferred from the claim text.