Decoder for a pay television system

Details Decoder for a pay television system Decoder for a pay television system

1985-10-31

1988-07-19

Buczinski, Stephen C.

Cryptography

Key management

Having particular key generator

235378, 358 84, 379131, 455 2, H04N 7167, H04N 700

Patent

active

047590602

ABSTRACT:
A decoder for a pay television system incorporates a receiver for receiving scrambled programming and control data transmitted from a remote location, with the control data including data corresponding to the program fee and the program status, and a manual switch for selectively descrambling the program data when the program status is a pay-per-view program. The decoder has a storage unit for storing a credit value, transmitted from the remote location, and the decoder has timer apparatus for measuring the time during which a pay-per-view program is being received and for subtracting a program fee periodically from the value stored in the storage unit, during the time of reception of the selected program, provided the switch is operated to descramble the program.

REFERENCES:
patent: 3508005 (1970-04-01), Hamburger
patent: 3760160 (1973-09-01), Gieringer et al.
patent: 4417101 (1983-11-01), Serres et al.
patent: 4484217 (1984-11-01), Block et al.

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