Basically, we have three options:
- Find the user who uploaded the image and make him/her chose a license
(great!)
- User can't be found, assuming good faith and calling it GFDL
- User can't be found, assuming nothing and deleting the image
Fourth option: Store them virtually indefinitely with a disclaimer, occupying some uncertain limbo between freeness and unfreeness.
Oh wait... that's what we're doing ;)
I have to reluctantly agree that we shouldn't assume anything when it comes to licensing. So maybe delete them as free alternatives are created. (So deleting the orphans should be ok...)
Brianna