Right. Please see Wikipedia:Image use policy#User-created images, which states, "All user-created images must be licensed under a free license such as the GFDL and/or an acceptable Creative Commons license, or they may also be released into the public domain, which removes all copyright and licensing restrictions." Also see Wikipedia:Non-free content criteria#4, which states, "Non-free content must have been published or publicly displayed outside Wikipedia." User-created content may not be used on Wikipedia under a fair-use claim. If Mr. Duncan is unwilling to release his contributions under a free license, we cannot use his work here. —