>-----Original Message-----
>From: Bob Axtell [mailto:cr_axtell@YAHOO.COM]
>
>I'm not sure what was originally needed. If the intention is
>to prove that a piece of video is actually yours, that CAN be
>done with a PIC operating as fast as possible, hopefully at
>14.31818 x 2 (NTSC) or 17m x 2 (PAL). You use an LM1881 to
>count lines, then have the PIC write a bit burst into a
>Vertical Interval line by using a Maxim video switch, i.e.
>paint the line white at that spot. Each bit will cover several
>pixels, but the idea is for it to be SEEN.
>
>To see your "watermark" simply misadjust the vertical height
>of any monitor and read the bit burst. You can fit about 32
>bits into the Vertical Interval.
>

But as an identification, any information not in the picture is very easy to
strip.  Trying to restore the original picture from a water arked version
would be more difficult.

Mike




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