RE: [WM]: security of watermarks

["Bloom Jeffrey" <Jeffrey.Bloom@thomson.net>]

Nilima,
 
If the video (or associated audio) contains a copy control watermark,
and if the recording device used to make the copies (not the camera, but
the deck used for duplication) has a watermark detector, then the
recording device could refuse to make the copies.

If the video contains a copy control watermark and consumer players have
watermark detectors, then the consumer players could refuse to play the
unauthorized copies.  This would probably reduce the value of those
copies.

If the video contains a forensic watermark, then the content owners can
analyze one of the copies and gain useful information about the source
of the piracy.  

If the captured video is put up on a server intended for distributing
user-generated content, the operator of that server may analyze the
fingerprints of the uploaded videos and compare those fingerprints to a
database of fingerprints from copyrighted material (not all, but the
stuff content owners are most concerned about).  If the fingerprinting
technology is robust enough and a smart database search strategy is
employed, the server operator will be able to identify the unauthorized
copy and remove it.

- Jeffrey

> -----Original Message-----
> From: watermarking-owner@watermarkingworld.org [mailto:watermarking-
> owner@watermarkingworld.org] On Behalf Of nrc3@ee.duke.edu
> Sent: Tuesday, January 23, 2007 10:41 PM
> To: watermarking@watermarkingworld.org
> Subject: ***[Possible UCE]*** Re: [WM]: security of watermarks
> 
> Hi watermarkers,
> I was wondering if a user bought one copy of video and then captured
the
> video  from the computer monitor/TV screen using a
> video camera and  resold many copies illegally.. How would
watermarking or
> fingerprinting secure  the video/image content ?
> 
> I would really appreciate anyone who can clarify on this fundamental
query
> ...
> 
> 
> -Nilima
> Quoting Teddy Furon <teddy.furon@irisa.fr>:
> 
> > See watermarking security articles here:
> > http://www.irisa.fr/temics/publis/show.php?search_author=Furon
> >
> > and also University of Vigo crew's works. for instance, there
> >http://www.gts.tsc.uvigo.es/gpsc/cgi-bin/bibsearch.cgi?
> > keyword=&author=comesa%F1a
> >
> > Teddy
> >
> >
> > On 23 janv. 07, at 15:03, Krause, Uschi wrote:
> >
> > > hello watermarkers,
> > >
> > > i'm currently writing my thesis on the topic "analysis of a
> > > watermarking and content security solution for a digital video
> > > archive".
> > >
> > > i've been evaluating different watermarking products and all the
> > > manufactures promise that watermarking is THE solution to protect
> > > digital media.
> > >
> > > i'm actually not so sure about that;-)
> > >
> > > true, a watermark cannot be removed unless you modify the data in
> > > such
> > > way, that the quality suffers and the data is of no use anymore.
> > >
> > > but what about the security aspect? as far as i understood, a
> > > watermark can be regarded as a pseudo-random-noise, generated by
> > > a  key. But any key (and any noise) can be cracked, right? How
> > > difficult
> > > would be it be or how time consuming to find out the key and the
> > > noise
> > > pattern?
> > >
> > > What do you reckon?
> > > Any help is appreciated.
> > >
> > > cheers,
> > > Uschi Krause


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