I've always wondered this, since a lot of times I go shooting with groups of people and we are all shooting the same subjects, I often times come away with nearly identical shots as someone else. I try my best to crop them a little different, but sometimes there's only one way to crop it to look good. That being said is there some sort of unspoken rule in photography if two people have nearly identical shots and someone else puts there photos out there in the public first?
I have quite a few photos sitting on my computer that I don't want to put online just because it looks just like someone else's photo even though I took it.