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Forget watermarking, etc ... instead use a method that mapmakers have long used to protect their maps (both paper and electronic) - they add extraneous data, such as some some short non-existent roads.
Insert an extra image or two into galleries that's unique for each member - more specifically, the extra image itself could be derived from the same raw image, but dynamically generated with slightly differing dimensions / file size, etc that's unique for each member.
Most people stealling images / video are lazy - so it's highly likely the "unique" image / video would be shared too allowing you an easy way to traceback to who leaked it without using watermarks, etc.
Hope this makes sense - read up more on how mapmakers protect their maps for a better explaination / ideas.
Speaking of google - their protection method of using a wrapper (as another poster pointed out), while simplistic, is amazingly effective - most people, including many techies, are clueless as to how to save YouTube videos - It doesn't stop the highly determined, but it's good enough for eliminating most unauthorized copying.
Ron
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Domagon - Website Management and Domain Name Sales
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