Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!tut.cis.ohio-state.edu!att!linac!midway!gargoyle!ddsw1!whos
From: whos@ddsw1.MCS.COM (Ben Feen)
Newsgroups: sci.electronics
Subject: Re: How does MacroVision CopyGuard work?
Keywords: An Answering machine work w/ a modem on PC
Message-ID: <1991Jan07.003508.21161@ddsw1.MCS.COM>
Date: 7 Jan 91 00:35:08 GMT
References: <1411@umvlsi.ecs.umass.edu> <35277@netnews.upenn.edu>
Reply-To: whos@ddsw1.MCS.COM (Ben Feen)
Distribution: sci.electronics
Organization: ddsw1.MCS.COM Contributor, Wheeling, IL
Lines: 13

In article <35277@netnews.upenn.edu> jliu@pender.ee.upenn.edu (Dear John.) writes:
>
>I'm curious....does anyone know how MacroVision copy protection works?
>Can someone please email me recent sci.e articles on it?
>
My guess is that 'they' tune the picture until it's on the edge of
distortion, so that when you copy the tape, the added resistance destroys
the picture completely.
-- 
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