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/usr/share/doc/libfftw3-bin/copyright is in libfftw3-bin 3.3.3-7ubuntu3.

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This package was debianized by James A. Treacy treacy@debian.org on
Tue, 22 Apr 2003 12:50:10 -0500

It was downloaded from http://fftw.org/download.html

The homepage for fftw is at http://fftw.org/

Copyright:

 Copyright (c) 2003, 2007-8 Matteo Frigo
 Copyright (c) 2003, 2007-8 Massachusetts Institute of Technology

License:

 This program 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.

 A copy of the GPL can be found in /usr/share/common-licenses/GPL-2