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July 1996, Week 4

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Subject:
From:
Brian McGugan <[log in to unmask]>
Reply To:
Film and TV Studies Discussion List <[log in to unmask]>
Date:
Wed, 24 Jul 1996 22:06:52 -0700
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You said:
>> More generally, does anyone know technical details about how these things
>> actually work (beyond the obvious, I mean)?
 
 
and I happen to have this answer from a person in the past...
>The way they can add copy protection is through inserting a high-peak
>outside the visual range of the tape. The TV ignores these peaks since it
>can't do anything useful with them. The VCR will freak out over those
>peaks and tries to adjust itself. The solution is to generate totally new
>sync.pulse. It will kill any form of copy protection since you only can
>use the sync-pulse to protect against copies. The system is called
>MacroVision. To regenerate the sync pulse is the best solution. The copy
>protection system works by high-peak insertion into main sync pulse,
>confusing AGC into over adjustement.
>
>Lars.
 
 
Cheers!
 
B.
 
                         Brian McGugan
     Box 15699 Main Post Office Vancouver B.C.
                       Canada  V6B 5B4
 
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