Cryptography – Cryptanalysis
Patent
1988-09-08
1989-12-26
Tarcza, Thomas H.
Cryptography
Cryptanalysis
380 20, H04N 7167
Patent
active
048903191
ABSTRACT:
A subscription television system for distributing program material protected by copyright to subscribers comprises a transmitter including a data insertion circuit for inserting a control bit in a transmitted signal comprising other control data and the protected program material. A receiver of the system includes a memory for storing a pre-assigned subscriber identification. Upon receipt and identification of the control bit at the receiver, the receiver inserts the subscriber identification into the program material so that any unauthorized copy made of the program material may be found to include the subscriber identification.
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Multichannel News, "Eidar Unveils PPV /Anti-taping System", Swasey, Oct. 3, 1988.
Bates Cameron
Lim Samson
Lucas Keith
Rassel William van
Seth-Smith Nigel
Scientific-Atlantic, Inc.
Tarcza Thomas H.
Wallace Linda J.
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