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Any license listed in the Wikimedia Commons upload procedure is acceptable.  One of the licenses is listed as ""preferred"" and that is the one I use myself.  You can click on each license to see its full terms and they are full of ""legalese"".  If she holds the copyright, then any Creative Commons license will work.  Please note that I am not a copyright expert.  Consult one if there are any questions or doubts.   "