Board Thread:Support Requests - Community Management/@comment-6776793-20130804034553/@comment-2200849-20130808125558

You can use templates like w:c:swfanon:Template:Fair use to express that you assume your use of the image is fair use under U.S. copyright law. You should preferably place the template on the image's file description page by simply placing  into the "Summary" text field on the Special:Upload page.

However, if a rights holder does find your image infringing, they'll contact Wikia, the web host, with a formal DMCA takedown request. While this can result in your image being deleted, I'm not aware of any legal consequences that may affect you.

Hope this clarified the stuation!