License

The expgram toolkit is released under the LGPL.

  The expgram toolkit is free software: you can redistribute it and/or modify
  it under the terms of the GNU Lesser General Public License as published
  by the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.

  The expgram toolkit 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 Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with the expgram toolkit.  If not, see <http://www.gnu.org/licenses/>.

Bundled Libraries

The expgram toolkit comes with other libraries which are licensed
under different copyrights. For details, see the licenses, briefly
listed here.

Murmurhash2

smhasher <http://code.google.com/p/smhasher/>

All code is released to the public domain. For business purposes, Murmurhash is under the MIT license. 

Murmurhash3

smhasher <http://code.google.com/p/smhasher/>

MurmurHash3 was written by Austin Appleby, and is placed in the public
domain. The author hereby disclaims copyright to this source code.

MIT license

xxhash <http://code.google.com/p/xxhash/>

   xxHash - Fast Hash algorithm
   Header File
   Copyright (C) 2012, Yann Collet.
   BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)

   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.
  
   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,
   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

        You can contact the author at :
        - xxHash source repository : http://code.google.com/p/xxhash/

boost.m4 <https://github.com/tsuna/boost.m4>

 The code of boost.m4 is released under GPLv3+ with the following additional
 clause:

 Additional permission under section 7 of the GNU General Public
 License, version 3 ("GPLv3"):

 If you convey this file as part of a work that contains a
 configuration script generated by Autoconf, you may do so under
 terms of your choice.

 This clause has been written by FSF lawyers for Autotools.  If you have any
 concerns about legal issues, do not contact me as I Am Not A Lawyer.  I
 *think* you can get advices at <copyright-clerk at fsf dot org>.  The intent
 here is to keep the code Free but to allow anyone to *use* it.
