Method of operating a pay per view television system

Details Method of operating a pay per view television system Method of operating a pay per view television system

1991-05-22

1995-12-26

Gregory, Bernarr E.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 10, 380 23, 348 55, 348 6, 348 10, 455 31, 455 41, 455 61, 455 62, H04N 7167

Patent

active

054795087

ABSTRACT:
A method of operating a cable system having premium channel encoders and dedicated smart pay per view encoders, each associated with an individual channel. The pay per view encoders are provided with the addresses of certain subscriber stations that have been approved to decode pay per view events on the associated channels. These certain subscriber stations are addressed on a priority basis by the pay per view encoder handling the pay per view event to set their authorization memories to decode the pay per view event. The authorization memories are updated by RAM groups of five program tags. All of the PPV encoders are assigned to the same RAM group so that in updating authorization memories, the authorization of a subscriber station memory for another pay per view event is not altered. The authorization process is rapidly accomplished and is repeated for a period of time after commencement of the pay per view event. The certain subscriber stations are immediately deauthorized by the same pay per view encoder at the end of the pay per view event.

REFERENCES:
patent: 4494142 (1985-01-01), Mistry
patent: 4577224 (1986-03-01), Ost
patent: 4658292 (1987-04-01), Okamoto et al.
patent: 4947429 (1990-08-01), Bestler et al.

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