Cryptography – Key management – Having particular key generator
Patent
1995-05-02
1996-11-26
Cain, David C.
Cryptography
Key management
Having particular key generator
380 10, 380 16, 380 20, 348 4, 360 60, H04N 7167
Patent
active
055793916
ABSTRACT:
A scramble system can effectively prevent a scrambled broadcast from being viewed illegally. In a scramble system in which a video signal scrambled by a scrambling apparatus (10) is descrambled by a decoding apparatus (20), an identification code that specifies the decoding apparatus (20) is inserted into a vertical blanking period of the video signal supplied to the decoding apparatus (20).
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Cain David C.
Maioli Jay H.
Sony Corporation
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