data/music/kart_grand_prix.ogg is CC-BY-SA 3.0.
http://forum.freegamedev.net/viewtopic.php?f=17&t=4082

Jon Ciesla
2013-02-04
BZ 891890

ocean and peach skins are now CC-BY-SA 3.0:
http://supertuxkart.svn.sourceforge.net/viewvc/supertuxkart/main/trunk/data/gui/skins/ocean/License.txt?r1=5993&r2=12069
http://supertuxkart.svn.sourceforge.net/viewvc/supertuxkart/main/trunk/data/gui/skins/peach/License.txt?r1=5993&r2=12069

Jon Ciesla
2013-05-07
BZ 891890