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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G11B20/00094
involving measures which result in a restriction to authorised record carriers
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G11B20/00123
the record carrier being identified by recognising some of its unique characteristics, e.g. a unique defect pattern serving as a physical signature of the record carrier
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