Method and an apparatus for preventing unauthorized copying of v

Details Method and an apparatus for preventing unauthorized copying of v Method and an apparatus for preventing unauthorized copying of v

1994-02-03

1996-01-02

Gregory, Bernarr E.

Cryptography

Cryptanalysis

380 10, 380 15, 360 371, 360 60, H04N 5913, H04N 592, H04N 7167

Patent

active

054816084

ABSTRACT:
A method and an apparatus for modifying video signals in such a manner that, when recording said signals with a tape recording apparatus, the control of this apparatus is disturbed, which signals comprise image point signals grouped according to image lines and preceded, in each line, by a line synchronization pulse and a colour synchronization signal, the plurality of lines being combined to a frame preceded by a frame synchronization pulse, the image point signals being situated at one side, and the synchronization pulses at the other side of a zero level, in which additional pulses resembling line synchronization pulses having a deviating shape or situated in deviating points of a frame are added. In particular, in at least a part of the frames, in a number of last lines the normal line synchronization pulses are removed in arbitrary locations, and, instead thereof, additional pulses with a deviating shape, and in particular a shorter duration, are introduced.

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JP Patent Abstracts of Japan, vol. 9, No. 35 (E-296)(1758), 14 Feb. 1985 #59178892 (Yuuzou Uehagi) 11 Oct. 1984.

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