Patent classifications
G
PHYSICS
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G11
INFORMATION STORAGE
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G11B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
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20/00
Signal processing not specific to the method of recording or reproducing; Circuits therefor
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G11B20/00086
Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
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G11B20/00884
involving a watermark, i.e. a barely perceptible transformation of the original data which can nevertheless be recognised by an algorithm
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G11B20/00891
embedded in audio data
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