The question has come up on [[Wikipedia:Possibly unfree images]] about images licensed under the UN license. That license says:

"UN photographs can be reproduced for editorial purposes only. They may not be used in advertising. All photos used must show the UN Photo credit line."

Personally I think these images are "free enough", as they could be used by any encyclopedia, commercial or non-commercial. But a couple people have argued against this.

I'd like to invite anyone interested to comment at http://en.wikipedia.org/wiki/Wikipedia_talk:Possibly_unfree_images