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I did a script a couple of years ago that inserts the users username into the image Exif data whenever a user loads an image. As others in this thread have mentioned Exif data is pretty easy for the user to remove and it does put a little extra load on the server. BUT, while it is easy to remove exif data, most surfers have no idea it exists and will never ever even consider removing it and in my experience more than 95% don't.
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