High security pay television system

Details High security pay television system High security pay television system

1987-04-22

1989-02-21

Buczinski, Stephen C.

Cryptography

Key management

Having particular key generator

380 20, 235375, 235378, 358 84, H04N 7167, G06K 1500

Patent

active

048072869

ABSTRACT:
A high security pay television system is provided in which television receivers include a decoder and with periodically changed removable memory modules. The decoder only functions to properly descramble the scrambled broadcase signal when a changeable system-wide code is available in the decoder. The code can either be carried in the memory module, or an internal code unique to the decoder and resident in the decoder can be combined with an external code in the removable memory module, and also unique to that decoder, to generate the common systemwide system code. Program viewership is written on the removable memory module which is returned to a central facility for later subscriber billing.

REFERENCES:
patent: 4484027 (1984-11-01), Lee et al.
patent: 4494143 (1985-01-01), Lovick et al.
patent: 4599647 (1986-07-01), George et al.
patent: 4696034 (1987-09-01), Wiedemer
patent: 4736421 (1988-04-01), Morita et al.

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