I had an idea for something very similar about 2 weekends ago. I dubbed it the "Watcher Watcher". It would be software which uses facial recognition to automatically inform/send copies/or block photography. The idea went from thinking about a demo of facial recognition that can scan an audience and then automatically send them any photos by looking up their info in an attendees list and using email, social network info, etc..., to having legally enforced requirements for any camera to have such software so that if you are being monitored publically, everyone is at least aware of all the photos and videos that are being taken of them at any time. Hence, "Watcher Watcher". I figure it would be very difficult legally, but it was just a "what if" kind of thought. To be able to go to some web site where you can view every picture or video taken of you - ever - would be a bit disconcerting, don't you think? It could even have a real time stream on your home page.