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Interesting concept, I think it has some market potential.
I think the best option is to have both kind of watermarks on a picture (video), visible and invisible.
Visible watermark has a substantial preventative potential because 90% of surfers wouldn't even think of sharing a file when they see it with their own eyes their personal info is on it (invisible watermarks would not have such an effect even if you put a huge warning on a page saying all pics (videos) are watermarked - some surfers wouldn't believe, some would not notice etc). But it can be removed.
Invisible watermarks have less of a scare potential, but they can't be removed and even if a visible watermark was blurred you'll still know who shared your content.
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