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/usr/share/doc/fftw-docs/copyright is in fftw-docs 2.1.5-4.1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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This package was debianized by James A. Treacy treacy@debian.org on
Wed, 30 Sep 1998 03:09:51 -0400.

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

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

Copyright:

 Copyright (c) 1997,1998 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