A much better place for such a tag IMHO is in the EXIF block. In fact, such a "copyright" EXIF tag already exists, but isn't commonly used or recognized on the

A much better place for such a tag IMHO is in the EXIF block. In fact, such a "copyright" EXIF tag already exists, but isn't commonly used or recognized on the web. Verifiability question remains though. I wonder if some kind of a decentralized system could be made to automatically register published images, so that first registration could be reliably proven. Not that first publication equates to copyright, but that would solve part of the problem.