If I tried to use another photographers pics then I'm stealing. The fact that it's a private event doesn't mean anything in this regard. All it means is I might be restricted in how I use the photos I've taken, but they still remain my property. Let's say someone had their camera (slr, p&s, doesn't matter) out there taking a few pics in between sessions and happen to get catch a pretty decent shot. Cool right? Guess what happens if STT finds that photo and tries to use it on their site or on material without permission because they think they own it? They can end up on the bad side of a copyright violation law suit. Since it's a private event they can say you can't shoot or to stop shooting, but the photos don't become their property. It doesn't work like that. It only limits how those photos can be used.