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1 @node License and Copyright, Concept Index, Acknowledgments, Top
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2 @chapter License and Copyright
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3
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4 FFTW is Copyright @copyright{} 2003, 2007-11 Matteo Frigo, Copyright
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5 @copyright{} 2003, 2007-11 Massachusetts Institute of Technology.
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6
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7 FFTW is free software; you can redistribute it and/or modify
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8 it under the terms of the GNU General Public License as published by
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9 the Free Software Foundation; either version 2 of the License, or
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10 (at your option) any later version.
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11
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12 This program is distributed in the hope that it will be useful,
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13 but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 GNU General Public License for more details.
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16
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17 You should have received a copy of the GNU General Public License along
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18 with this program; if not, write to the Free Software Foundation, Inc.,
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19 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA You can also
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20 find the @uref{http://www.gnu.org/licenses/gpl-2.0.html, GPL on the GNU
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21 web site}.
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22
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23 In addition, we kindly ask you to acknowledge FFTW and its authors in
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24 any program or publication in which you use FFTW. (You are not
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25 @emph{required} to do so; it is up to your common sense to decide
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26 whether you want to comply with this request or not.) For general
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27 publications, we suggest referencing: Matteo Frigo and Steven
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28 G. Johnson, ``The design and implementation of FFTW3,''
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29 @i{Proc. IEEE} @b{93} (2), 216--231 (2005).
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30
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31 Non-free versions of FFTW are available under terms different from those
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32 of the General Public License. (e.g. they do not require you to
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33 accompany any object code using FFTW with the corresponding source
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34 code.) For these alternative terms you must purchase a license from MIT's
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35 Technology Licensing Office. Users interested in such a license should
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36 contact us (@email{fftw@@fftw.org}) for more information.
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37
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38
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