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I believe the point that was being made is that the watermark does not pass the test for non-repudiation. Just because an ebook shows up on a file sharing site with a watermark that traces back to my purchase does not mean that I put it there. Someone could have logged on my computer and uploaded it. My computer could have been stolen. I might have sold my computer and not performed a full data wipe and someone ran an un-erase. Any number of other conditions.
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