If you have any questions please ask them at the Media copyright questions page. (en.wikipedia.org)
I understand that it works differently as the license is supposed to be infectious, but copyright question still remains. (law.stackexchange.com)
50 Shades of Grey, which started out as Twilight - inspired fan fiction, raised a few copyright questions that didn't stop it from selling millions and millions of copies. (gigaom.com)