eWeek: Cryptography Guru Paul Kocher Speaks Out

[Peter J. Nicol]

>
>  It occurred to me that one way to attack a watermarking system that I
>  haven't heard proposed before is instead of removing the watermark, bury it
>  in other watermarks.  While this approach would degrade the quality, it
>  might not degrade it enough to bother the people who trade video camera
>  pointed at the screen copies of movies.

http://slashdot.org/comments.pl?sid=19548&cid=1878668

describes a simple method to remove the watermark on a photoshop image, using
another watermark.


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