The code written in this repository including the SAT solver is MIT licensed.
The QBF solver links to GPLv3 licensed DepQBF and is therefore GPLv3 licensed.
The interface between the solver module and the rest of the software is generic
and not considered direct usage, so the rest of the software is considered to
still be MIT. This has not been examined in more detail though, so no guarantee
for this can be given yet. If one wants to be certain that no GPLv3 code is
included, the QBF solver module must be removed.

The MIT License (MIT)
=====================

Copyright © 2019-2020 Max Heisinger, Mathias Fleury, Armin Biere, Johannes Kepler University Linz, Austria

Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the “Software”), to deal in the Software without
restriction, including without limitation the rights to use,
copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following
conditions:

The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.
