Background. A friend has a web site. He received an email that one of the photos on the site was owned by X. However, Y also said he owned the photo. This brings up the question, how does one prove they "own" the picture, eg. are the photographer and copyright holder. Unless the photo is officially copyright, then I do not see how anyone can really prove original ownership. I guess having the RAW original would be the best, but how do you use that to force someone to pay you for the work? I am looking thoughts on this issues, but a hard and fast legal opinion would be nice.