1@node License and Copyright, Concept Index, Acknowledgments, Top
2@chapter License and Copyright
3
4FFTW is Copyright @copyright{} 2003, 2007-11 Matteo Frigo, Copyright
5@copyright{} 2003, 2007-11 Massachusetts Institute of Technology.
6
7FFTW is free software; you can redistribute it and/or modify
8it under the terms of the GNU General Public License as published by
9the Free Software Foundation; either version 2 of the License, or
10(at your option) any later version.
11
12This program is distributed in the hope that it will be useful,
13but WITHOUT ANY WARRANTY; without even the implied warranty of
14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15GNU General Public License for more details.
16
17You should have received a copy of the GNU General Public License along
18with this program; if not, write to the Free Software Foundation, Inc.,
1951 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA You can also
20find the @uref{http://www.gnu.org/licenses/gpl-2.0.html, GPL on the GNU
21web site}.
22
23In addition, we kindly ask you to acknowledge FFTW and its authors in
24any program or publication in which you use FFTW.  (You are not
25@emph{required} to do so; it is up to your common sense to decide
26whether you want to comply with this request or not.)  For general
27publications, we suggest referencing: Matteo Frigo and Steven
28G. Johnson, ``The design and implementation of FFTW3,''
29@i{Proc. IEEE} @b{93} (2), 216--231 (2005).
30
31Non-free versions of FFTW are available under terms different from those
32of the General Public License. (e.g. they do not require you to
33accompany any object code using FFTW with the corresponding source
34code.)  For these alternative terms you must purchase a license from MIT's
35Technology Licensing Office.  Users interested in such a license should
36contact us (@email{fftw@@fftw.org}) for more information.
37
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