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/usr/share/doc/plink1.9/copyright is in plink1.9 1.90~b3.31-160203-1.

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Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: PLINK2
Upstream-Contact: Christopher Chang <chrchang@alumni.caltech.edu>
Source: https://www.cog-genomics.org/plink2/

Files: *
Copyright: 2005-2009 Shaun Purcell <plink@chgr.mgh.harvard.edu>
           2012-2016 Christopher Chang <chrchang@alumni.caltech.edu>
License: GPL-3

Files: bgzf.*
Copyright: 2008 Broad Institute / Massachusetts Institute of Technology
           2011-2012 Attractive Chaos <attractor@live.co.uk>
           2009-2014 Genome Research Ltd
License: Expat

Files: hfile.* hfile_internal.h hts_defs.h
Copyright: 2013-2015 Genome Research Ltd
License: Expat

Files: hts.h
Copyright: 2012 Broad Institute
           2012-2014 Genome Research Ltd
License: Expat

Files: khash.h
Copyright: 2008-2011 Attractive Chaos <attractor@live.co.uk>
License: Expat

Files: pigz.c
Copyright: 2007-2013 Mark Adler, Christopher Chang
License: Zlib

Files: plink.c
Copyright: 2005-2016 Shaun Purcell, Christopher Chang
License: GPL-3+
Comment:
  -----------------
  Date: Tue, 3 Feb 2015 19:11:58 +0100
  From: Dylan <bob.dybian at gmail.com>
  To: <chrchang@alumni.caltech.edu>
  .
  Dear Christopher Chang,
  As you already know, I making a package of plink 1.9 for Debian Med. I have
  a question about license of plink 1.9. Plink 1.9 is licensed under GPL-3,
  but the header of the "plink.c" file says that the software is released
  under GPL-3+ ("or any later version"). Could you please confirm me that it
  is a mistake and the license is only GPL-3 and not GPL-3+ ?
  .
  Best regards,
  Dylan
  -----------------
  Date: Tue, 3 Feb 2015 10:16:16 -0800
  From: Chris Chang <chrchang@alumni.caltech.edu>
  To: Dylan <bob.dybian@gmail.com>
  .
  Hi Dylan,
  .
  I actually intended to allow any later version.  I will modify the other
  files to reflect this.
  .
  --Chris
  -----------------

Files: plink_glm.c
Copyright: 2012-2015 Christopher Chang,
           2009-2014 Shigeo Mitsunari <herumi@nifty.com>
License: GPL-3 and BSD-3-Clause

Files: plink_ld.c
Copyright: 2012-2015 Christopher Chang,
           2012-2014 Richard Howey <richard.howey@ncl.ac.uk> (CASSI software)
License: GPL-3

Files: Rconnection.*
Copyright: 2004-8 Simon Urbanek
License: LGPL-2.1

Files: Rsrv.h
Copyright: 2002-13 Simon Urbanek
License: LGPL-2.1

Files: sisocks.h
Copyright: 2000,1 Simon Urbanek
License: LGPL-2.1

Files: SFMT.*
Copyright: 2006-2012 Mutsuo Saito, Makoto Matsumoto, Hiroshima University and The University of Tokyo
License: BSD-3-clause

Files: yarn.*
Copyright: 2008-2012 Mark Adler <madler@alumni.caltech.edu>
License: Zlib

Files: debian/*
Copyright: 2008 Steffen Moeller <moeller@debian.org>
           2009-2012 Andreas Tille <tille@debian.org>
           2014-2016 Dylan Aïssi <bob.dybian@gmail.com>
License: GPL-3

License: GPL-3
 This package is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License in version
 3 of the license as published by the Free Software Foundation.
 .
 This package 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.
 .
 You should have received a copy of the GNU General Public License
 along with this package; if not, write to the Free Software
 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 .
 On Debian systems, the complete text of the GNU General
 Public License can be found in `/usr/share/common-licenses/GPL-3'.

License: GPL-3+
 This package 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 3 of the License, or
 (at your option) any later version.
 .
 This package 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.
 .
 You should have received a copy of the GNU General Public License
 along with this package; if not, write to the Free Software
 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 .
 On Debian systems, the complete text of the GNU General
 Public License can be found in `/usr/share/common-licenses/GPL-3'.

License: Expat
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the
 "Software"), to deal in the Software without restriction, including
 without limitation the rights to use, copy, modify, merge, publish,
 distribute, sublicense, and/or sell copies of the Software, and to
 permit persons to whom the Software is furnished to do so, subject to
 the following conditions:
 .
 The above copyright notice and this permission notice shall be included
 in all copies or substantial portions of the Software.
 .
 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

License: Zlib
 This software is provided 'as-is', without any express or implied
 warranty.  In no event will the authors be held liable for any damages
 arising from the use of this software.
 .
 Permission is granted to anyone to use this software for any purpose,
 including commercial applications, and to alter it and redistribute it
 freely, subject to the following restrictions:
 .
 1. The origin of this software must not be misrepresented; you must not
    claim that you wrote the original software. If you use this software
    in a product, an acknowledgment in the product documentation would be
    appreciated but is not required.
 2. Altered source versions must be plainly marked as such, and must not be
    misrepresented as being the original software.
 3. This notice may not be removed or altered from any source distribution.

License: LGPL-2.1
 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU Lesser General Public License in version
 2.1 of the license as published by the Free Software Foundation.
 .
 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 Lesser General Public License for more details.
 .
 You should have received a copy of the GNU Lesser General Public License
 along with this program; if not, write to the Free Software
 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
 .
 On Debian systems, the complete text of the GNU Lesser General
 Public License can be found in `/usr/share/common-licenses/LGPL-2.1'.

License: BSD-3-clause
 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 copyright holder nor the names of its contributors
      may not 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, 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.