Working for Xerox I can assure you that all of our colour machines together
with all our competitors colour machines leave a "trace".
Pointer to how this trace is applied, recorded, accounted for,
and handled when components are swapped out?
--dan
Eugene Leitl [EMAIL PROTECTED] writes:
Well, the deformations must be smooth, so this just describes an
attack against a certain type of watermarks.
Yes. They found that there was one watermarking product on the market
that was not defeated by their standard mechanism, and developed a new
Hi Eugene,
There are many parts of your recent comments which I disagree with, as
much as I understand them. Some of what you write isn't really clear
to me, and I don't feel like debating each point in detail.
However, here are a two points of clarification, regarding "Napster"
and my
As far as I know, all fielded watermarking schemes can be defeated
with simple, invisible distortions of the image - see
http://www.cl.cam.ac.uk/~fapp2/steganography/
for work done by Fabien Petitcolas and Ross Anderson. You don't even
have to have more than one copy of the picture or know
On Sat, 15 Jan 2000, Eugene Leitl wrote:
Joe Sixpack also doesn't believe that color laser copiers leave an
unique signature on each copy, allowing you to trace the copy to an
individual device. Nevertheless these are there, and can be evaluated
if need arises. (Just try distributing a few
Well, the deformations must be smooth, so this just describes an
attack against a certain type of watermarks.
As I said, it is difficult to resiliently watermark a single image.
Paul Crowley writes:
As far as I know, all fielded watermarking schemes can be defeated
with simple, invisible
--Original Message-
From: bram [mailto:[EMAIL PROTECTED]]
Sent: Monday, January 17, 2000 8:20 AM
To: Eugene Leitl
Cc: [EMAIL PROTECTED]
Subject: Re: Blue Spike and Digital Watermarking with Giovanni
On Sat, 15 Jan 2000, Eugene Leitl wrote:
Joe Sixpack also doesn't believe that color laser cop
[EMAIL PROTECTED] (Sat 01/15/00 at 06:06 PM -0800):
arguments can be made for why you don't need to get that many texts
even given no knowledge of the watermark system. I'll post more if
pushed --PM]
Please do, this sounds interesting.
ditto.
[Joe Sixpack has nothing to to lose
Digital watermarks again!
Joe Sixpack won't believe his file contains a digital watermark with
his name in it unless there is a freely distributed Windows/Mac
program which reads the watermark and so spits out his name and other
personal details.
That being the case, it is only a matter of
What use is the watermark anyway? It is only applicable to files
generated for a specific, legally identifiable customer. Therefore it
does not apply to pre-pressed CD/DVD etc. discs or to broadcasts via
the Net, TV, radio etc.
Well, serial numbers are somewhat useful in tracking pirate
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