I belive macrovision works by modulating the signal of the output. As
the signal gets very high, modern tvs compensate for the high and
equalize the signal. Then as the signal becomes low, the opposite
occurs. When going though another device like a VCR, the signal gets
clipped or cropped by the VCR and in effect making the maximum signal
strength the highest output (such that the image is visable). When the
signal goes low, the VCR does not adjust and add gain to the signal so
the picture signal gets lost.

By compensating for the signal strength via a powered relay b4 going to
tv or vcr can fix this problem. Also old beta systems are capable of
doing this and recording the video. Some HI8 systems are also know to
act as this buffer and allow recording of MVed movies.

Hope this helps

Aaron

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Michael Rigby-Jones
Sent: Monday, January 20, 2003 12:26 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [OT]: Am I getting Macrovisioned?

> -----Original Message-----
> From: Andy Kunz [SMTP:montana@FAST.NET]
> Sent: Sunday, January 19, 2003 12:23 AM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Re: [OT]: Am I getting Macrovisioned?
>
> Macrovision patented the circuit to bypass the protection mechanism.
That
> prevents folks from legally making and selling devices to bypass it,
but
> individuals are free to use the circuit in non-commercial means.
>
> I suggest a visit to uspto.gov will help.
>
> Andy
>
>
I'm sure there must be many possible circuit designs that would work.
Can
they protect against a circuit that has a particular function instead of
a
particular design?

Regards

Mike


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