Anti-copy protection for a video signal

a video signal and anti-copy technology, applied in the field of raster scanning video signal modification methods and apparatuses, can solve the problems of reduced picture quality and unattractive video signal viewing, and achieve the effect of unattractive viewing
US20050111661A1Inactive Publication Date: 2005-05-26SMARDTV SA
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
SMARDTV SA
Publication Date
2005-05-26
Estimated Expiration
Not applicable · inactive patent

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Abstract

An apparatus and method for applying anti-copy protection to a raster-scanned video signal are described. A square waveform 52 is added to the vertical synchronisation pulses 50 of the video signal. The effect of the waveform is not apparent until it has been recorded by a video cassette recorder. The anti-copy protected video signal can therefore be viewed normally on a display device at or near to the picture quality intended by the originator of the video signal, but once recorded, exhibits a reduction in picture quality which makes the video signal quite unattractive to view.
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Description

[0001] The present application relates to a method and an apparatus for modifying a raster-scanned video signal such that the modified video signal will still be viewable on a display device, such as a television screen, but that following recording of the modified video signal, playback of the recorded modified signal will be adversely affected.

[0002] The present application provides a way of preventing unauthorised copying of an original video signal, and may be used, in particular, to deter copying onto tape of Pay-Per-View video signals, and video-to-video (tape-to-tape) copying.

[0003] Video piracy is a significant problem for broadcasters and distributors of video signals, since the unauthorised copying and distribution of video recordings by pirates can impact drastically on the revenue generated by a broadcaster or distributor through legitimate sales. It is therefore desirable to prevent video pirates from making unauthorised copies of video signals.

[0004] This is best ac...

Claims

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