AHH! I finally get to be of use now!
First off, in regards to photos on private property, I think that pertains more to if you are trespassing onto the private property when there is a no trespassing sign. I have been told by Paramedics that by taking pictures of them assisting a man who was injured and inebriated, that I was violating patient/doctor privacy. This was not true as it was being used for news worthy information, and there was technically no doctor on the scene as well as the fact it was on public college property.
Okay, first thing, copyright law. Whoever takes the picture owns the picture. Simple as that.
NOTICE -- to all who have photoshop/bridge/lightroom. Go into File info and copyright your photos.
If someone takes your photo and calls it their own work, you have the legal right to tell them to take it down, and if they don't you can pursue them for damages and such.
Example (and using real people as an example and I am eating oreos so its gonna be people from this thread): I take a photo and place it on Smugmug. Now lets say Mr. Silmero went on to SM and took the pic and called it his own because he needed work or something. I am within my right to tell him that he needs to take the photo down immediately. He must do it or a lawsuit will happen.
Example 2: My photos are on SmugMug, this is known. Now if 2010's Kumoricon Publicity director went onto SmugMug and decided to take one of my photos without informing me, this would be illegal. And if it went into print, I would be within my legal right to deny them use of that photo in all of the printed papers, therefore, all books printed, could essentially be rendered useless.
Now when it comes to photoshoots. ANYONE who was involved in a photoshoot, not a random "can I take your picture!" con moment but a real legit photoshoot, TECHNICALLY, the photographer needed to have a photo release with him and signed by each individual (you can expect this next year if/when I come back under photographer/doing photoshoots)
Photo releases can say a variety of things saying "your picture may appear for publicity use" to anything like "your picture will be sold online and by signing this, you agree to those terms" and if you signed it, you're locked into it.
Now if no releases were signed, then this is another interesting part. Now if you are in a photoshoot and you don't like how you looked in ANY pictures with you in them, you are within your right to tell the photographer to take them offline. And the photographer has to agree.
Now the FINE line between this is what is the photo being used for? Sale? Portfolio? News?
If its news and you're caught on camera you're SOL.
Best example is by Jason D. and the photo of Rikku, Yuna and Paine with the Security Guard. IMO, that photo comes off as more journalism worthy than photoshoot/artistic. If the security guard, associates or even hotel secuirty managers said "I don't want that picture online." they're SOL.
Now for people taking pictures of you on the street. Deal with it. You can't prevent them from doing it. Its like yelling at the cops because you were caught on a security camera without your knowledge and didn't approve of it. Its life. PLUS, believe it or not, conspicuous photos can turn out VERY well.