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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)
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.