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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G11B20/0021
involving encryption or decryption of contents recorded on or reproduced from a record carrier
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G11B20/00485
characterised by a specific kind of data which is encrypted and recorded on and/or reproduced from the record carrier
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G11B20/00492
wherein content or user data is encrypted
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G11B20/00514
wherein the entire content is encrypted with the same key, e.g. disc key or master key
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