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 38 39