Signal reproducing/recording/transmitting method and apparatus a

Details Signal reproducing/recording/transmitting method and apparatus a Signal reproducing/recording/transmitting method and apparatus a

1996-07-19

2000-08-22

Gregory, Bernarr E.

Cryptography

Video cryptography

Copy protection or prevention

380200, 380201, 380202, 380239, 713193, H04L 900

Patent

active

061084239

ABSTRACT:
A signal reproducing apparatus for prohibiting copying or unauthorized use. The apparatus includes a copying management information decision circuit 19 for discriminating the state of the copying management information read out from each header of a data sector and within the TOC, a protect signal generating circuit 20 for generating a protect signal based on the discrimination signal and a mixing circuit 24 for mixing a protect signal in a vertical blanking period of an analog video signal D/A converted from digital video data reproduced from an optical disc D. The apparatus also includes a descrambling circuit 31 for descrambling the digital data based on the copying management information and a scrambling circuit 32 for descrambling the digital data. The apparatus enables prohibition of unauthorized analog copying and digital copying, inhibition of serial generational copying and prohibition of unauthorized analog and digital copying simultaneously.

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