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Posted by Martin Heffels on 08/31/06 16:24
On 31 Aug 2006 08:55:19 -0700, "Andy Dingley" <dingbat@codesmiths.com>
wrote:
>I've heard it used, but rarely in this sense, and never in relation to
>web streaming. I think the term used to be used in TV. I've always
>called them watermarks too.
Watermark is a printing term, while videobug is used in, uhm well,
television (staion-id).
>Visible are good at discouraging blagging, invisible are good at
>proving things after you've caught the blagger. It's sometimes
>particularly useful if every copy gets a unique invisible watermark -
>then you can track just _who_ let their copy get copied.
Invisible watermarks in video can easily be removed by re-rendering the
video, which shuffles the bits around, making the hidden watermark
disappear again. Obviously, if they are hiddin in a safe area, where one
can put specific user-data, which is "outside" the video-information, this
won't happen. But a geek can find those areas in publications, and simply
write an eraser.
cheers
-martin-
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