Thanks for making the topic sticky anyways ! This might be a good thing, if we can't have an own forum on this and it is respected.
However, as copyright is such a big matter, and either willingly or by accident often not respected, perhaps another thing could help:
On the main website a big, red text that Copyright-holder are the photographers who put online. Photographers must always be asked in case someone wants to use the photo.
As well, and I have NO clue whether such is technically feasible - not a watermark, but automatically with every photo (under the photo!!) comes text that says:
Copyright lies within the photographer, using photo without asking permission is strictly forbidden.
OK, might not look very neat to have that text under every photo, but at least it is not IN the photo but nobody could say that the folks have not been warned and playing innocent wouldn't be an option anyore !
It is just an idea.. not sure what you folks think about it :-D