Apparatus and method for preventing unauthorized copying of vide

Details Apparatus and method for preventing unauthorized copying of vide Apparatus and method for preventing unauthorized copying of vide

1993-07-21

1995-05-23

Gregory, Bernarr E.

Cryptography

Cryptanalysis

380 3, 380 20, 380 23, 358335, 358339, 360 60, H04N 716, H04N 576

Patent

active

054188539

ABSTRACT:
In a digital video tape recorder (VTR) which reproduces digital video and audio signals from a magnetic tape, a copy protect bit in the reproduced digital video signal is detected, and on the basis of the copy protect bit, a code is generated and inserted into the vertical blanking interval of the reproduced video signal. When a video signal (which may be in analog or digital form) having the code in the vertical blanking interval is received in a digital VTR, the code is detected and recording of the video signal and an associated audio signal is inhibited if the code indicates that the received video signal is copy protected.

REFERENCES:
patent: 3801732 (1974-04-01), Reeves
patent: 3824332 (1974-07-01), Horowitz
patent: 3919462 (1975-11-01), Hartung et al.
patent: 4019201 (1977-04-01), Hartung et al.
patent: 4100575 (1978-07-01), Morio et al.
patent: 4163253 (1979-07-01), Morio et al.
patent: 4213149 (1980-07-01), Janko
patent: 4336554 (1982-06-01), Okada et al.
patent: 4439785 (1984-03-01), Leonard
patent: 4475129 (1984-10-01), Kagota
patent: 4479146 (1984-10-01), Cohn
patent: 4488176 (1984-12-01), Bond et al.
patent: 4488183 (1984-12-01), Kinjo
patent: 4571642 (1986-02-01), Hofstein
patent: 4631603 (1986-12-01), Ryan
patent: 4636852 (1987-01-01), Farmer
patent: 4775901 (1988-10-01), Nakano
patent: 4890319 (1989-12-01), Seth-Smith et al.
patent: 4907093 (1990-03-01), Ryan
patent: 5057947 (1991-10-01), Shimada
patent: 5157510 (1992-10-01), Quan et al.
patent: 5177618 (1993-01-01), Dunlap et al.
patent: 5182680 (1993-01-01), Yamashita et al.
Electronic Industries Association of Japan, Technical File of Stereo Technical Committee, Video Technical Committee, STC-007, Consumer User PCM Encoder-Decoder, 1979-6.
Electronic Industries Association of Japan, Technical File of Stereo Technical Committee, Video Technical Committee, STC-007, Consumer User PCM Encoder-Decoder, 1979-6, Journal of the Audio Engineering Society, Apr. 1980, vol. 28, No. 4 pp. 260-265.
Todokoro et al., PCM Sound Recording and Playback System Utilizing VCR, Toshiba Review, vol. 35, No. 2, 1980, pp. 96-98.
International Electrotechnical Commission, Draft Standard-Digital Audio tape (DAT) cassette system; Part 6: Serial copy management system; Nov. 1989.

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