The "antechamber" and "tleap" codes are provided under the GNU General Public
Library, version 2.  A copy of this license is in the file "GPL".  The
copyright to the antechamber source code is held by Junmei Wang and David A.
Case, (c) 2005.

The "mopac6" code has been placed in the public domain by its authors.  Here
is the statement from the source code:
C
C         Notice of Public Domain nature of MOPAC
C
C      'This computer program is a work of the United States
C       Government and as such is not subject to protection by
C       copyright (17 U.S.C. # 105.)  Any person who fraudulently
C       places a copyright notice or does any other act contrary
C       to the provisions of 17 U.S. Code 506(c) shall be subject
C       to the penalties provided therein.  This notice shall not
C       be altered or removed from this software and is to be on
C       all reproductions.'
C

The force field parameter files in the "dat" subdirectory have been placed in
the public domain by their authors.

Note especially the following, from the GPL file:

    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.

