[WikiEN-l] Copyright, images and the voicing of doubt

[Tony Sidaway]

What is the policy on copyrights that are disputed on suspicion?

Suppose there exists a photograph donated under GFDL and the uploader says
that it was produced by him.
Is the assertion of doubt by a third party _alone_ reason to post this as
a "possible" copyright violation and recommend it for deletion on that
basis?
I'm not talking about the case where circumstantial evidence or other
evidence exists to suggest that the image is a copyright violation.  Only
that someone has voiced the possibility that it is one.