RE: [MLUG - DISCUSSION] DVd saga... over?

["Spurling, Shannon " <EMAIL:PROTECTED>]

Yeah, see? They are exploiting a weakness or bandwidth limitation in the
hardware to scramble the content. That's not a valid way to do it. How are
you going to make sure that a future performance improvement isn't going to
negate what you depend on to do your copy protection. You depend on a
undocumented "feature" of the hardware to do something, how do you know it's
always going to be there? It still doesn't affect that if you can reliably
copy the signal, you can reproduce it.

Shannon Spurling
WAN Engineer -Specialist

MOREnet, Network Services, Core Network
3212 Le Mone Industrial Blvd.
Columbia, MO 65201

Main:(573) 884-7200   Fax:(573)884-6673

EMAIL:PROTECTED
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-----Original Message-----
From: Ian Scott [mailto:EMAIL:PROTECTED]
Sent: Tuesday, May 01, 2001 11:42 AM
To: EMAIL:PROTECTED
Subject: RE: [MLUG - DISCUSSION] DVd saga... over?


--On Tuesday, May 01, 2001 09:30:20 -0500 "Spurling, Shannon " 
<EMAIL:PROTECTED> wrote:

> Okay, here's the question. If the VCR removes the macrovision, then if I
> connect straight up to the TV, I will be blocked from seeing the content I
> have viewing rights to. Correct?
> So the TV has to remove it. If I have an older TV that was bought before
> macrovision, and so it does not have the filter hardware, I must buy an
> external filter. Wait a second, what are they going to do? Make me buy a
> new TV? This whole thing seams kind of stupid. If I were to record the
> macrovision signal completely, I should be able to repeat it in a way that
> behaves as the original, and defeats the "Copy protection".

This isn't how Macrovision works.  Read the Macrovision FAQ at 
http://www.digital-digest.com/dvd/support/macro.html for more info.
To make a long story short, it exploits part of the AGC circuit that is 
part of the VHS spec.  TVs, if they have an AGC circuit at all, probably 
aren't designed like the VHS ones, so they're immune.  So, TVs of any age 
are just fine. (And so are some older VCRs)

That site also has schematics for circuits to remove Macrovision.

Ian
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