System for processing user access control data at a decoder

Details System for processing user access control data at a decoder System for processing user access control data at a decoder

1993-09-03

1994-12-13

Swann, Tod R.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 10, H04K 100

Patent

active

053735579

ABSTRACT:
A subscriber/user TV system operates in response to locally stored entitlements. A user gains access to a program only if the description of the program is consistent with entitled rights owned by the user. Each night at a given hour, decoders affiliated with the system tune to a predetermined video or audio channel, a so-called Barker channel. Decoders previously in a stand-by mode are activated in order to tune to the Barker channel. The program provider then sends the entitlement data on the Barker channel while every affiliated decoder is responsive to an incoming data stream.

REFERENCES:
patent: 4471379 (1984-09-01), Stephens
patent: 4475123 (1984-10-01), Dumbauld et al.
patent: 4503462 (1985-03-01), Kelly et al.
patent: 4558464 (1985-12-01), O'Brien et al.
patent: 5046093 (1991-09-01), Wachob
patent: 5058160 (1991-10-01), Banker et al.
patent: 5231664 (1993-07-01), Bestler et al.
Patent Abstracts of Japan-JP5808936 Published Aug. 16, 1983.

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