Recorded medium for video control system

Details Recorded medium for video control system Recorded medium for video control system

1990-03-29

1991-09-03

Tarcza, Thomas H.

Cryptography

Cryptanalysis

380 20, H04N 7167

Patent

active

050460900

ABSTRACT:
A video recording medium storing a video program includes a series of television fields including a first field containing both a random digital code encrypted according to a code encryption key and program identification data, and a second field containing an unintelligible video signal previously transformed from an intelligible video signal according to the random digital code.

REFERENCES:
patent: 4329711 (1982-05-01), Cheung
patent: 4533949 (1985-08-01), Fujimura et al.
patent: 4635112 (1987-01-01), Tomioka et al.
patent: 4792973 (1988-12-01), Gilhousen et al.
patent: 4833710 (1989-05-01), Hirashima
patent: 4890319 (1989-12-01), Seth-Smith et al.
patent: 4890320 (1989-12-01), Monslow et al.
patent: 4890322 (1989-12-01), Russell, Jr.

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