I think WRT recognition, I don't think it would be fair to stipulate complete exclusivity with each entry.
However, common sense does come into play, and a shot shouldn't be submitted if it's likely to be quite easily be spotted and associated with a particular member, due to it being shown elsewhere.
While we want the competition to be as anonymous as possible, to be too strict would be quite restrictive.
Like I say though, common sense should come into play.
If I have submitted a shot to a forum with 5 members who only speak swahilian (and aren't members here) and I wanted to also enter it here, then you bet your bottom dollar I would be doing.
But likewise, I wouldn't enter a shot that I've just been given credit for on the front page of BBC News. It's all about likelihood of being spotted.
If I spot an entry being shown on another forum, but I can't tie in that user to this forum, then I see no reason why it should be disallowed. If though, forum names are exactly the same, etc then it becomes tricky.
I personally haven't recognised any of the shots from this round, except one, which was shown on someones website I was browsing. But as I know who has entered what, then I'm allowed to know