RepSnapper is copyright Kulitorum and others, and is licensed under the terms of the GPL version 2.0 (see the file licenses/GPL-2.0.txt) Segments of the code fall under other licenses, as detailed below. arcball.cpp and arcball.h are (C) 1999-2003 Tatewake.com and licensed under the MIT license as noted in the file licenses/MIT.txt Several functions in slicer/geometry.cpp are licensed as follows: Copyright 2001 softSurfer, 2012-13 Dan Sunday This code may be freely used, distributed and modified for any purpose providing that this copyright notice is included with it. SoftSurfer makes no warranty for this code, and cannot be held liable for any real or imagined damage resulting from its use. Users of this code must verify correctness for their application.