Text 2313, 59 rader
Skriven 2005-02-02 12:06:00 av Glenn Meadows (1:379/45)
   Kommentar till text 2311 av Adam Flinton (1:379/45)
Ärende: Re: MS and Macrovision join forces
==========================================
From: "Glenn Meadows" <gmeadow@comcast.net>

Has anyone broken the Digital photo watermark and been able to successfully
remove it? (I don't know, serious question).

--
Glenn M.


"Adam Flinton" <adam_NO_@_SPAM_softfab.com> wrote in message
news:42010c1c@w3.nls.net...
> Glenn Meadows wrote:
>
> > I think this is far more than the original Macrovision anti-copying
that's
> > been applied to VHS tapes, essentially and out of picture super white
signal
> > that causes video AGC circuits to clamp down and give super dark copies.
I
> > believe this is more in the embedded watermark approach.  I know that
tons
> > of money is being spent on the audio side to perfect a real audio
> > watermarking technology that survives digital to analog conversion and
back.
> > I've done some listening tests on various systems in true A/B/X testing,
and
> > some were virtually inaudible, and others were blatantly obvious
(damaged
> > the music).  The goal is to allow the original audio (and video) to be
> > watermarked, and once added/mixed in, is virtually unremoveable.
> >
> > In the audio tests, the watermark was recoverable (and by extension if
you
> > can recover and detect it, you can inhibit copying on new devices so
> > equipped to detect it as part of the recording process) even when the
file
> > was reduced to a 28kb mp3 file.
> >
> > It's analogous to the watermarking done in photography.  Once you can
embed
> > and make it very difficult to remove, then you can make devices that
will
> > check/confirm the ability to copy.
> >
> > To get these devices into the mass market, will take years, but the
effort
> > is ongoing, as will be the attempts to circumvent those efforts.
> >
> > This is NOT meant to restart the copyright discussion, as we all get
nowhere
> > but sideways on that topic...<smile>.
> >
>
> What man can make man can break....
>
> Adam

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