Method for controlling copying of protected information transmit

Cryptography – Cryptanalysis

Patent

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Details

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.

REFERENCES:
patent: 4040099 (1977-08-01), Cook
patent: 4439785 (1984-03-01), Leonard
patent: 4528588 (1985-07-01), Lofberg
patent: 4595950 (1986-06-01), Lofberg
patent: 4694490 (1987-09-01), Harvey et al.
patent: 4704725 (1987-11-01), Harvey et al.
patent: 4752676 (1988-06-01), Leonard et al.
Multichannel News, "Eidar Unveils PPV /Anti-taping System", Swasey, Oct. 3, 1988.

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