Going back to the trespass example, not only am I required to put up signage, if I have on my property an "attractive nuisance" (IE a creek with a swimming hole or a bluff that photographers might want to take photographs from), I'm also required to put up fencing to keep people out, so they don't get hurt. The point is that the photographer as the owner of the image rights has to take responsibility for protecting his work, which includes control of where he posts those images on the internet, the signage, legalese, and locks as best he can. Like my swimming hole example, people will still walk past the signs, and even climb the fence, sorry that's the way people are. The very things that make the internet so attractive (a giant world without fences or signs) are it's greatest dangers, yet people will not only blindly share their images with the misguided belief that they are safe from theft. Not saying it's right, but it's the way it is. The very things that make the internet so attractive (a big world without signs or fences) are also the biggest dangers.