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This won't really stop anything but casual theft, however. The committed thief has a lot of other options, including turning off javascript in their browser or looking in their cache.
When it comes to images, I don't know of any way to disable a simple screen capture -- that does the job and also bypasses embedded copyright messages.
(not that I agree with people who pilfer images, but maybe 90% of the people online don't even know what "copyright" means.... you can always have lawyers explain the term to them, but that might be better saved for issues such as pagejacking)
A good general resource is WDVL : Graphics : Theft [wdvl.com]
If anyone has experience using any these services, feel free to jump in.
In almost three years, he's had no cause to use it against theft at all. But he has had one new client who tracked him down through Digimarc, rather than directly through the website.
He feels that using Digimarc is a sign of his legitimate standing as a professional.