The majority of the software in the rbmake library and utilities is licensed under the Artistic license:
Rbmake is Copyright 2000 by Wayne Davison.This program is free software; you can redistribute it and/or modify it under the terms of the "Artistic License" which is contained in the file "Artistic".
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the Artistic License for more details.
The hash routines were originally written by Geoffrey Collyer, and were heavily modified by Wayne Davison for use in this package. The routines in hashfile.c have this copyright:
Copyright (C) 1992 by Geoffrey Collyer
Copyright (C) 2000 by Wayne Davison.This software is not subject to any license of the American Telephone and Telegraph Company, the Regents of the University of California, or the Free Software Foundation.
Permission is granted to anyone to use this software for any purpose on any computer system, and to alter it and redistribute it freely, subject to the restrictions in hashtable.c.
Some of the image routines were taken from the netpbm utilities by Jef Poskanzer and were modified by Wayne Davison for use in this package. The routines in imgfile.c have this copyright:
Copyright (C) 1989 by Jef Poskanzer.
Copyright (C) 2000 by Wayne Davison.Permission to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby granted, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation. This software is provided "as is" without express or implied warranty.