Patent
Method and apparatus for processing a video signal so as to prohibit the making of acceptable video tape recordings thereof
TLDR
In this article, a video signal is modified so that a television receiver will still provide a normal color picture from the modified video signal while a videotape recording of the recorded video signal produces generally unacceptable pictures.Abstract:
A video signal is modified so that a television receiver will still provide a normal color picture from the modified video signal while a videotape recording of the modified video signal produces generally unacceptable pictures. This invention relies on the fact that typical videocassette recorder automatic gain control systems cannot distinguish between the normal sync pulses (including equalizing or broad pulses) of a conventional video signal and added pseudo-sync pulses. Pseudo-sync pulses are defined here as any other pulses which extend down to a normal sync tip level and which have a duration of at least 0.5 microseconds. A plurality of such pseudo-sync pulses is added to the conventional video signal during the vertical blanking interval, and each of such pseudo-sync pulses is followed by a positive pulse of suitable amplitude and duration. As a result, the automatic gain control system in a videotape recorder will make a false measurement of video level which causes an improper recording of the video signal. The result is unacceptable picture quality during playback. This approach utilizes positive-going pulses which occur at a time not ordinarily used for black-level restoration in typical television receivers, and therefore does not give rise to black level depression in such typical television sets.read more
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Patent
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Patent
Copy protection for hybrid digital video tape recording and unprotected source material
TL;DR: In this article, a hybrid digital/analog video recorder prevents both analog and digital copying by detecting anti-copy bits present in the input material and in response preventing recording, and then adding an anti copy bit to the input digital stream, preventing later copying of such material.
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Apparatus and method for preventing unauthorized copying of video signals
TL;DR: In this article, a copy protect bit in the reproduced digital video signal is detected, and a code is generated and inserted into the vertical blanking interval of the reproduced video signal in a digital video tape recorder.
Patent
System and method for providing a low power receiver design
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References
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Patent
Method of and apparatus for modifying a video signal to prevent unauthorized recording and reproduction thereof
Minoru Morio,Masahiro Kambara +1 more
TL;DR: In this article, a modified video signal is transmitted and then recorded on a video signal recorder, but a satisfactory video picture cannot be reproduced if that recorded modified video signals subsequently is played back.
Patent
Scrambling and unscrambling video signals in a pay TV system
TL;DR: In this paper, a video signal is scrambled by replacing its vertical intervals with dummy video signal lines, and information relating to the timing of the replaced vertical intervals is encoded using an encryption key and is distributed with the scrambled video signal by modulation of the horizontal sync.
Patent
Subscriber television system
TL;DR: In this paper, a video recorder has a first transducer which moves with respect to a moving tape to selectively record and play back video information; the tape has a control region which is accessed for recording or playback by a second transducers.
Patent
Method and apparatus for preparing recorded program material to prevent unauthorized duplication by magnetic tape recording
TL;DR: In this paper, the authors present a method and apparatus for preventing unauthorized duplication of recorded audible program material upon magnetic tape, commonly known as tape piracy, by generating a high frequency modulated signal which varies in a predetermined manner over a selected spectrum of frequencies.
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