Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1994-07-01
1996-12-10
Cain, David C.
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
380 10, 380 16, H04N 7167
Patent
active
055839371
ABSTRACT:
A method for providing video programming in a nearly on demand basis is disclosed. A video network includes a video server that operates several video recorders to simultaneously exhibit video performances or programs on a plurality of channels. The video server is controlled in real time in accordance with data presented to it in an exhibition plan. The exhibition plan calls for two or more channels to show the same program on a time offset basis. Due to the offset in exhibiting a given program, a subscriber may view a program at any time, from the beginning of a program, by waiting for a period of time that is no longer than the offset. Preferably, this offset is substantially shorter than the run time of the program. The channels carrying this program are unscrambled prior to the beginning of the program and for a predetermined duration into the program so that subscribers may preview the program. However, the channels are scrambled for the remainder of the exhibition of the program. A subscriber may order the program when it begins and for a short duration after the program becomes scrambled.
REFERENCES:
patent: 4878245 (1989-10-01), Bradley et al.
patent: 4945563 (1990-07-01), Horton et al.
patent: 4947429 (1990-08-01), Bestler et al.
patent: 5058160 (1991-10-01), Banker et al.
Calaby Lauren F.
Gillett Thomas F.
Seibel David E.
Ullrich Kathryn E.
Walker Stephen S.
Cain David C.
GTE Laboratories Incorporated
GTE Service Corporation
Odozynski John A.
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