Protecting audio/video content during storage and playback...

Cryptography – Video cryptography – Copy protection or prevention

Reexamination Certificate

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Details

C380S210000, C380S212000, C713S193000, C713S194000

Reexamination Certificate

active

07110542

ABSTRACT:
A system for protecting audio/video content during storage and playback on systems with open buses receives a multiplexed signal, including a plurality of A/V signals and decryption keys. Following a request for a channel, a single scrambled A/V signal and its associated decryption keys are extracted from the multiplexed signal. The decryption keys are PCX-encrypted while the scrambled signal remains untouched. Both the encrypted decryption keys and the scrambled signal are stored on the system. During storage, the surreptitious piracy of the signals may be avoided.

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patent: 2002/0188567 (2002-12-01), Candelore

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