GROMACS is free software, distributed under the GNU General Public License. 
See COPING for details. It however includes optional code covered by several 
different licences as described below.


1. Trajectory file reading using VMD plugins 
   Files: include/molfile_plugin.h
          include/vmddlopen.h
          include/vmdplugin.h
          src/gmxlib/vmddlopen.c
          src/gmxlib/vmdio.c

                (C) Copyright 1995-2009 The Board of Trustees of the
                            University of Illinois
                             All Rights Reserved

Developed by:           Theoretical and Computational Biophysics Group
                        University of Illinois at Urbana-Champaign
                        http://www.ks.uiuc.edu/

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the Software without restriction, including without limitation the rights to
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of the Software, and to permit persons to whom the Software is furnished to
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this list of conditions and the following disclaimers.

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this list of conditions and the following disclaimers in the documentation
and/or other materials provided with the distribution.

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University of Illinois at Urbana-Champaign, nor the names of its contributors
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS WITH THE SOFTWARE.

2. Internal FFT
   Files: src/mdlib/fftpack.c

Copyright (c) 2005-2011, NumPy Developers.
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

    * Redistributions of source code must retain the above copyright
       notice, this list of conditions and the following disclaimer.

    * Redistributions in binary form must reproduce the above
       copyright notice, this list of conditions and the following
       disclaimer in the documentation and/or other materials provided
       with the distribution.

    * Neither the name of the NumPy Developers nor the names of any
       contributors may be used to endorse or promote products derived
       from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

fftpack.c : A set of FFT routines in C.
Algorithmically based on Fortran-77 FFTPACK by Paul N. Swarztrauber (Version 4, 1985).