Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1989-11-22
1990-08-07
Tarcza, Thomas H.
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
358 84, H04L 902
Patent
active
049474294
ABSTRACT:
A method of operating a pay per view television system in which the television signal includes a program tag and an IPPV tag identifying memory locations in subscriber authorization memories. A subscriber can self-authorize his terminal decoder to unscramble a pay per view program with a password that inputs a "1" to the memory location identified by the IPPV tag. The program tag is changed to indicate the memory location identified by the IPPV tag, thus enabling subscribers who bought the program to unscramble the signal. The head-end periodically polls each subscriber terminal to determine the status of the second memory location and to reset it to "0" after the pay per view event.
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Bestler Charles B.
Citta Richard W.
Gosc Paul M.
Cain David
Tarcza Thomas H.
Zenith Electronics Corporation
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