Re: A Media Distribution Problem

From: Andrew Swallow (am.swallow_at_eatspam.btinternet.com)
Date: 05/31/04 

Date: Sun, 30 May 2004 23:41:50 +0000 (UTC)

"Simon Johnson" <ckwop@hotmail.com> wrote in message
news:c9dkjd$ro0$1@titan.btinternet.com...
>
[snip]
>
> I propose that rather than trying to defend against copying itself a
better
> approach is to forget about protecting against copying but be sure you can
> catch the copiers when they copy. This is a much easier problem. If you
can
> run some code on the video stream before you send it to the client you can
> imbed a watermark that's provably undetectable and robust [1]. The system
> would be configured such that each of your users will have a watermark
> imbedded on the fly. Each user's watermark would be different and the
media
> would be streamed to them using an encrypted channel.

To give each subscriber a separate watermark a separate
steam has to be sent to each subscriber. You require a
bandwidth thousands, possibly millions of times bigger.
Instead of a single server, to a first approximation, each
subscriber ends up having their own server. A big increase
in cost.

Andrew Swallow

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