Images sourced from Stock.xchng (sxc.hu) are not allowed on Wikimedia Commons, unless they are explicitly licensed under a free license. Preferably those permissions are recorded in OTRS. All Stock.xchng image that have not been independently released under a free license have been subject to deletion since 1 July 2007. See Commons:Deletion requests/Template:Sxc-warning and Template:Sxc-warning for more information.
Any images sourced from Stock.xchng that were uploaded since 29 December 2005 should be deleted.