Method for television scrambling

Details Method for television scrambling Method for television scrambling

1987-02-26

1991-02-12

Wallace, Linda J.

Cryptography

Key management

Having particular key generator

358349, H04N 7167

Patent

active

049930664

ABSTRACT:
A method and device for inexpensively and efficiently controlling the distribution of pay-per-access information services is disclosed including varying scrambling methods and user exchangeable cards.

REFERENCES:
patent: 2817824 (1957-12-01), Albright
patent: 3274333 (1966-09-01), Shanahan
patent: 3531582 (1970-09-01), Walker
patent: 4025948 (1977-05-01), Loshin
patent: 4471379 (1984-09-01), Stephens
patent: 4599647 (1986-07-01), George et al.
patent: 4623919 (1986-11-01), Welch
patent: 4663664 (1987-05-01), Ragan et al.
patent: 4696034 (1987-09-01), Wiedemer

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