[13150] in cryptography@c2.net mail archive
Re: eWeek: Cryptography Guru Paul Kocher Speaks Out
daemon@ATHENA.MIT.EDU (Bill Frantz)
Wed Apr 30 19:50:54 2003
X-Original-To: cryptography@metzdowd.com
X-Original-To: cryptography@metzdowd.com
In-Reply-To: <be153b424fdcbcc81eddf5bb53676d83@dizum.com>
Date: Wed, 30 Apr 2003 14:06:40 -0700
To: cryptography@metzdowd.com
From: Bill Frantz <frantz@pwpconsult.com>
At 11:20 AM -0700 4/30/03, Nomen Nescio wrote:
>Or is it possible that our technical analyses are mistaken, and that
>it is actually possible to program devices to watermark the content
>they play in such a manner that the marks can't be practically removed?
>If so, what is the secret?
I am always suspicious of "impossible" statements and "proofs". After
attending last weeks EE380 on Real-Time Watermarking systems
<http://www.stanford.edu/class/ee380/Abstracts/030423.html>, I think it may
be possible to add multiple watermarks, with enough redundancy to survive
the combination of a large number of copies. The need for a large number
of copies will work against the casual "file sharer".
Given that the above is possible, the idea that the player watermarks its
output might actually act as a plug to the "analog hole". Moral of the
story: If you are going to share, buy your player with cash in a remote
city.
Cheers - Bill
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