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Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!ihnp4!stolaf!umn-cs!smith
From: smith@umn-cs.UUCP
Newsgroups: net.video
Subject: Copyguard
Message-ID: <6100001@umn-cs.UUCP>
Date: Wed, 13-Mar-85 10:41:00 EST
Article-I.D.: umn-cs.6100001
Posted: Wed Mar 13 10:41:00 1985
Date-Received: Thu, 14-Mar-85 06:42:46 EST
Lines: 17
Nf-ID: #N:umn-cs:6100001:000:827
Nf-From: umn-cs!smith    Mar 13 09:41:00 1985


  I've been collecting graphics examples from TV with my VCR and I'm
wondering about what's in store if I try to collect examples from cassette
movies as well.  In particular I'm wondering about 'copyguarding'.
I've heard that it essentially weakens a synch signal so that the image
can usually be displayed but can't be accurately recorded.  A side-effect
seems to be that some TVs can't reliably display copyguarded tapes.

Questions:

1. Do all manufacturers routinely copyguard tapes?  Is there a degradation
   in the image of copyguarded tapes even on 'modern' TVs?

2. Is there some way of controlling the effects without buying one of those
   copyguard defeaters?  For example, I have both RF and audio/video output
   from my deck.  Is one or the other less succeptible?  Would my tracking
   control do me any good?