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Watermark was a widely discussed thing in the 90's for digital photos and pdf . Pretty sure it was mostly abandoned in widespread usage, but I have seen it on photographers websites so could be wrong there.
A watermark would be pretty trivial to remove IMO, so not a deterrent to a large scale knowledgeable pirates although it would allow the publishers to catch a few.
The big drawback that I see is in order to trace a book each watermark has to be unique to the purchaser. Each book would have to be processed by the seller, and while I am sure it can be done, how many sellers would want to do it. They could pay adobe to do it for them, as adobe has a lot of expertise in this area, but why would they switch if they are already invested in DRM.
Helen
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