On 08/07/12 19:21, Seth Woodworth wrote:
The argument you are making are focused on copyright, but when you are more specific, you seem to be desiring attribution, and want to ensure that that attribution is legally enforceable. Please forgive me if I am putting words in your mouth.
--Seth
The fact is, it isn't that important that Wikimedia Commons gets convinced that it's new copyright. A US-based company could ignore the CC-BY tag and happily reuse it violating the license, and you would have to assert your copyright (in order to enforce the license) in the court.