http://www.terragalleria.com/licensing-terms.html
http://photography-on-the.net/forum/showthread.php?t=330529
http://photography-on-the.net/forum/showpost.php?p=4329570&postcount=2
http://creativecommons.org/choose/
http://andrewstott.net/license/
http://www.downtheroad.org/photo_use/photo_license_agreement.htm