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Is there an example of a web server that does steganographic watermarking?

You could imagine a web app that serves subtly different versions of a page to each user. For example, it might encode the identity of the user in the images it serves. This would be a per-user ...
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VCS to manipulate returned trees to prevent leaks? [closed]

I am wondering if there is any system that would change source code trees in subtle from version control systems in ways that are hard to discover (i.e. whitespaces at the ends of lines, perhaps even ...
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Is there a way to detect and extract steganographically hidden data from a picture? [duplicate]

Possible Duplicate: Detecting Steganography in images Is there a way to detect and extract hidden data from picture which altered by steganography? For example, If someone tried to spill ...