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(fftw.info)License and Copyright

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License and Copyright
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   FFTW is copyright (C) 1997-1999 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.  You can
also find the GPL on the GNU web site (http://www.gnu.org/copyleft/gpl.html).

   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
*required* to do so; it is up to your common sense to decide whether
you want to comply with this request or not.)

   Non-free versions of FFTW are available under terms different than
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 alternate terms you must purchase a license from MIT's Technology
Licensing Office.  Users interested in such a license should contact us
(<fftw@fftw.org>) for more information.