A hypothetical question, but one that could have come up for me if the picture was a little bit more important:
Suppose a person supplies a camera for a group of people to use ... say, a wedding, or they bring their camera to a reunion or something. Several different people grab the camera over time and fill a roll or a card. The original owner of the camera (who may also have used the camera) takes the camera home and processes the images, perhaps puts them on the internet.
Who owns the individual shots? For purposes of:
...bragging rights? (awwww, this captures the perfect moment!)
...obstruction of use? (I don't want that picture of my cousin on the internet! I took the shot just as he was about to sneeze.)
...potential fame and profit? (Hey! Is that the Loch Ness Monster in the background?)
...business? (I'm sure I took this photo, and I want to use it in my portfolio!)
If each individual photographer owns "their" shots, how can it be proven who took which ones?