x-kernel
Copyright (c) 1996,1993,1991,1990 Arizona Board of Regents
Permission to use, copy, modify, distribute, and sell this software and its documentation for any purpose is hereby granted without fee, provided that the above copyright appears in all copies, and that both the copyright and this permission notice appear in supporting documentation, and that the name of the University of Arizona or the Arizona Board of Regents not be used in advertising or publicity pertaining to distribution of the software without specific, written prior permission. The University of Arizona makes no representations about the suitability of this software for any purpose. It is provided ``as is'' without express or implied warranty.
The University of Arizona requests users of this software to return any improvements or extensions that they make, and to grant the University of Arizona the rights to redistribute these changes.