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fftw-3.3.10/doc/license.texi

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+@node License and Copyright, Concept Index, Acknowledgments, Top
+@chapter License and Copyright
+
+FFTW is Copyright @copyright{} 2003, 2007-11 Matteo Frigo, Copyright
+@copyright{} 2003, 2007-11 Massachusetts Institute of Technology.
+
+FFTW 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 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
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along
+with this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA You can also
+find the @uref{http://www.gnu.org/licenses/gpl-2.0.html, GPL on the GNU
+web site}.
+
+In addition, we kindly ask you to acknowledge FFTW and its authors in
+any program or publication in which you use FFTW.  (You are not
+@emph{required} to do so; it is up to your common sense to decide
+whether you want to comply with this request or not.)  For general
+publications, we suggest referencing: Matteo Frigo and Steven
+G. Johnson, ``The design and implementation of FFTW3,''
+@i{Proc. IEEE} @b{93} (2), 216--231 (2005).
+
+Non-free versions of FFTW are available under terms different from those
+of the General Public License. (e.g. they do not require you to
+accompany any object code using FFTW with the corresponding source
+code.)  For these alternative terms you must purchase a license from MIT's
+Technology Licensing Office.  Users interested in such a license should
+contact us (@email{fftw@@fftw.org}) for more information.
+
+