From Fedora Project Wiki

License Notes

This is a BSD derived Free license, but clause 3 makes it GPL-incompatible, due to the need to include "the reasons for the changes". A copy of this license was taken from http://www.arkkra.com/doc/license.html on 2013-02-15.

License Text

 Copyright (c) 1995-2012  by Arkkra Enterprises.
 All rights reserved.

 Redistribution and use in source and binary forms,
 with or without modification, are permitted provided that
 the following conditions are met:

 1. Redistributions of source code must retain
 the above copyright notice, this list of conditions
 and the following DISCLAIMER.

 2. Redistributions in binary form must reproduce the above
 copyright notice, this list of conditions and
 the following DISCLAIMER in the documentation and/or
 other materials provided with the distribution.

 3. Any additions, deletions, or changes to the original files
 must be clearly indicated in accompanying documentation.
 including the reasons for the changes,
 and the names of those who made the modifications.

	DISCLAIMER

 THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS
 OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 THE IMPLIED WARRANTIES OF MERCHANTABILITY
 AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT,
 INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
 OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO
 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 (INCLUDING NEGLIGENCE OR OTHERWISE)
 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.