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---
# License and Copyright
---
libctl is copyright © 1998—2019, Steven G. Johnson.
libctl is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
This library 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 GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this library; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. You can also find it on the GNU web site:
[http://www.gnu.org/copyleft/gpl.html](http://www.gnu.org/copyleft/gpl.html)
Many of the files in libctl are individually licensed under the terms of the GNU Lesser General Public License; either version 2 of the License, or (at your option) any later version. This is indicated by the licensing comments at the top of each file. There are a few files in libctl that we place in the public domain, which are not restricted by the terms of the GPL or LGPL; these files explicitly indicate this fact at the top of the file. *All files fall under the GPL unless they expressly say otherwise.*
The files `src/integrator.c` and `src/cintegrator.c` contain multi-dimensional numeric integration code that was adapted in part from [HIntLib](http://mint.sbg.ac.at/HIntLib/) by Rudolf Schuerer and from the [GNU Scientific Library](https://en.wikipedia.org/wiki/GNU_Scientific_Library) by Brian Gough. Both of these libraries are licensed under the GNU GPL, version 2 or later.
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