What would happen if someone photoshopped a picture already on the web? would it be able to detect the original content or attribute the photoshopped image to a new the user that posted it? Could you potentially have models where when you moused over parts it would tell you what the clothing was instead of tagging each individual article of clothing. I would wonder how specific a content would have to be and how something like girl talk (a mix of multiple songs in short clips mixed together) would appear. I love the idea and you are going to make some businesses incredibly wealthy along with yourself. It's brilliant