Encoding an optical video disc to inhibit video tape recording

Details Encoding an optical video disc to inhibit video tape recording Encoding an optical video disc to inhibit video tape recording

1989-12-18

1991-03-26

Tarcza, Thomas H.

Cryptography

Cryptanalysis

380 10, 380 14, 360 60, H04N 7167

Patent

active

050035908

ABSTRACT:
A system and method for encoding an optional video disc to inhibit unauthorized recording of played back signals by conventional videotape recorders is provided. A source program is mounted on a video signal generating means. The video signal is modified by increasing and decreasing time durations from a standard horizontal line duration of pre-established maximums and minimums. The modified video signal is recorded on a previously blank optical video disc.

REFERENCES:
patent: 3963865 (1976-06-01), Songer
patent: 4550341 (1985-10-01), Naito
patent: 4642688 (1987-02-01), Lowry et al.
patent: 4700388 (1987-10-01), Okada et al.
patent: 4736420 (1988-04-01), Katznelson et al.
patent: 4914694 (1990-04-01), Leonard et al.

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