This package was debianized by Ivo Timmermans <ivo@debian.org> on
Fri,  3 Aug 2001 10:02:38 +0200.
It was taken over by Matthias Urlichs <smurf@debian.org>, and is now
maintained by Andreas Metzler <ametzler@debian.org> Eric Dorland
<eric@debian.org>, James Westby <jw+debian@jameswestby.net>


It was downloaded from https://ftp.gnupg.org/gcrypt/libgcrypt/.

Up to end of 2012 libgcrypt copyright was owned solely by FSF, since then
contributions without copyright assignment to the FSF have been integrated.

Upstream Authors (from AUTHORS)
8X---------------------------------------------------
Library: Libgcrypt
Homepage: https://www.gnupg.org/related_software/libgcrypt/
Download: https://ftp.gnupg.org/ftp/gcrypt/libgcrypt/
          ftp://ftp.gnupg.org/gcrypt/libgcrypt/
Repository: git://git.gnupg.org/libgcrypt.git
Maintainer: Werner Koch <wk@gnupg.org>
Bug reports: https://bugs.gnupg.org
Security related bug reports: <security@gnupg.org>
End-of-life: TBD
License (library): LGPLv2.1+
License (manual and tools): GPLv2+


Libgcrypt is free software.  See the files COPYING.LIB and COPYING for
copying conditions, and LICENSES for notices about a few contributions
that require these additional notices to be distributed.  License
copyright years may be listed using range notation, e.g., 2000-2013,
indicating that every year in the range, inclusive, is a copyrightable
year that would otherwise be listed individually.


List of Copyright holders
=========================

  Copyright (C) 1989,1991-2018 Free Software Foundation, Inc.
  Copyright (C) 1994 X Consortium
  Copyright (C) 1996 L. Peter Deutsch
  Copyright (C) 1997 Werner Koch
  Copyright (C) 1998 The Internet Society
  Copyright (C) 1996-1999 Peter Gutmann, Paul Kendall, and Chris Wedgwood
  Copyright (C) 1996-2006 Peter Gutmann, Matt Thomlinson and Blake Coverett
  Copyright (C) 2003 Nikos Mavroyanopoulos
  Copyright (c) 2006 CRYPTOGAMS
  Copyright (C) 2006-2007 NTT (Nippon Telegraph and Telephone Corporation)
  Copyright (C) 2012-2022 g10 Code GmbH
  Copyright (C) 2012 Simon Josefsson, Niels Möller
  Copyright (c) 2012 Intel Corporation
  Copyright (C) 2013 Christian Grothoff
  Copyright (C) 2013-2022 Jussi Kivilinna
  Copyright (C) 2013-2014 Dmitry Eremin-Solenikov
  Copyright (C) 2014 Stephan Mueller
  Copyright (C) 2017 Jia Zhang
  Copyright (C) 2018 Bundesamt für Sicherheit in der Informationstechnik
  Copyright (C) 2020 Alibaba Group.
  Copyright (C) 2020 Tianjia Zhang


Authors with a FSF copyright assignment
=======================================

LIBGCRYPT       Werner Koch    2001-06-07
Assigns past and future changes.
Assignment for future changes terminated on 2012-12-04.
wk@gnupg.org
Designed and implemented Libgcrypt.

GNUPG	Matthew Skala		   1998-08-10
Disclaims changes.
mskala@ansuz.sooke.bc.ca
Wrote cipher/twofish.c.

GNUPG	Natural Resources Canada    1998-08-11
Disclaims changes by Matthew Skala.

GNUPG	Michael Roth	Germany     1998-09-17
Assigns changes.
mroth@nessie.de
Wrote cipher/des.c.
Changes and bug fixes all over the place.

GNUPG	Niklas Hernaeus 	1998-09-18
Disclaims changes.
nh@df.lth.se
Weak key patches.

GNUPG	Rémi Guyomarch		1999-05-25
Assigns past and future changes. (g10/compress.c, g10/encr-data.c,
g10/free-packet.c, g10/mdfilter.c, g10/plaintext.c, util/iobuf.c)
rguyom@mail.dotcom.fr

ANY     g10 Code GmbH           2001-06-07
Assignment for future changes terminated on 2012-12-04.
Code marked with ChangeLog entries of g10 Code employees.

LIBGCRYPT Timo Schulz           2001-08-31
Assigns past and future changes.
twoaday@freakmail.de

LIBGCRYPT Simon Josefsson       2002-10-25
Assigns past and future changes to FSF (cipher/{md4,crc}.c, CTR mode,
CTS/MAC flags, self test improvements)
simon@josefsson.org

LIBGCRYPT Moritz Schulte	2003-04-17
Assigns past and future changes.
moritz@g10code.com

GNUTLS  Nikolaos Mavrogiannopoulos  2003-11-22
nmav@gnutls.org
Original code for cipher/rfc2268.c.

LIBGCRYPT	The Written Word	2005-04-15
Assigns past and future changes. (new: src/libgcrypt.pc.in,
src/Makefile.am, src/secmem.c, mpi/hppa1.1/mpih-mul3.S,
mpi/hppa1.1/udiv-qrnnd.S, mpi/hppa1.1/mpih-mul2.S,
mpi/hppa1.1/mpih-mul1.S, mpi/Makefile.am, tests/prime.c,
tests/register.c, tests/ac.c, tests/basic.c, tests/tsexp.c,
tests/keygen.c, tests/pubkey.c, configure.ac, acinclude.m4)

LIBGCRYPT       Brad Hards       2006-02-09
Assigns Past and Future Changes
bradh@frogmouth.net
(Added OFB mode. Changed cipher/cipher.c, test/basic.c doc/gcrypt.tex.
 added SHA-224, changed cipher/sha256.c, added HMAC tests.)

LIBGCRYPT       Hye-Shik Chang   2006-09-07
Assigns Past and Future Changes
perky@freebsd.org
(SEED cipher)

LIBGCRYPT       Werner Dittmann  2009-05-20
Assigns Past and Future Changes
werner.dittmann@t-online.de
(mpi/amd64, tests/mpitests.c)

GNUPG           David Shaw
Assigns past and future changes.
dshaw@jabberwocky.com
(cipher/camellia-glue.c and related stuff)

LIBGCRYPT       Andrey Jivsov    2010-12-09
Assigns Past and Future Changes
openpgp@brainhub.org
(cipher/ecc.c and related files)

LIBGCRYPT       Ulrich Müller    2012-02-15
Assigns Past and Future Changes
ulm@gentoo.org
(Changes to cipher/idea.c and related files)

LIBGCRYPT       Vladimir Serbinenko  2012-04-26
Assigns Past and Future Changes
phcoder@gmail.com
(cipher/serpent.c)


Authors with a DCO
==================

Andrei Scherer <andsch@inbox.com>
2014-08-22:BF7CEF794F9.000003F0andsch@inbox.com:

Christian Aistleitner <christian@quelltextlich.at>
2013-02-26:20130226110144.GA12678@quelltextlich.at:

Christian Grothoff <christian@grothoff.org>
2013-03-21:514B5D8A.6040705@grothoff.org:

Clemens Lang <cllang@redhat.com>
2022-02-10:20220210133844.46581-1-cllang@redhat.com:

Danny Tsen <dtsen@us.ibm.com>
2021-12-20:OF85D11C2F.7A339D7D-ON002587B1.0042A81E-002587B1.0042B94D@ibm.com

Dmitry Baryshkov <dbaryshkov@gmail.com>
Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
2013-07-13:20130713144407.GA27334@fangorn.rup.mentorg.com:

Dmitry Kasatkin <dmitry.kasatkin@intel.com>
2012-12-14:50CAE2DB.80302@intel.com:

H.J. Lu <hjl.tools@gmail.com>
2020-01-19:20200119135241.GA4970@gmail.com:

Jia Zhang <qianyue.zj@alibaba-inc.com>
2017-10-17:59E56E30.9060503@alibaba-inc.com:

Jérémie Courrèges-Anglas <jca@wxcvbn.org>
2016-05-26:87bn3ssqg0.fsf@ritchie.wxcvbn.org:

Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
2012-11-15:20121115172331.150537dzb5i6jmy8@www.dalek.fi:

Jussi Kivilinna <jussi.kivilinna@iki.fi>
2013-05-06:5186720A.4090101@iki.fi:

Markus Teich <markus dot teich at stusta dot mhn dot de>
2014-10-08:20141008180509.GA2770@trolle:

Martin Storsjö <martin@martin.st>
2018-03-28:dc1605ce-a47d-34c5-8851-d9569f9ea5d3@martin.st:

Mathias L. Baumann <mathias.baumann at sociomantic.com>
2017-01-30:07c06d79-0828-b564-d604-fd16c7c86ebe@sociomantic.com:

Milan Broz <gmazyland@gmail.com>
2014-01-13:52D44CC6.4050707@gmail.com:

Paul Wolneykien <manowar@altlinux.org>
2019-11-19:20191119204459.312927aa@rigel.localdomain:

Peter Wu <peter@lekensteyn.nl>
2015-07-22:20150722191325.GA8113@al:

Rafaël Carré <funman@videolan.org>
2012-04-20:4F91988B.1080502@videolan.org:

Sergey V. <sftp.mtuci@gmail.com>
2013-11-07:2066221.5IYa7Yq760@darkstar:

Shawn Landden <shawn@git.icu>
2019-07-09:2794651562684255@iva4-64850291ca1c.qloud-c.yandex.net:

Stephan Mueller <smueller@chronox.de>
2014-08-22:2008899.25OeoelVVA@myon.chronox.de:

Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
2020-01-08:dcda0127-2f45-93a3-0736-27259a33bffa@linux.alibaba.com:

Tomáš Mráz <tm@t8m.info>
2012-04-16:1334571250.5056.52.camel@vespa.frost.loc:

Vitezslav Cizek <vcizek@suse.com>
2015-11-05:20151105131424.GA32700@kolac.suse.cz:

Werner Koch <wk@gnupg.org> (g10 Code GmbH)
2012-12-05:87obi8u4h2.fsf@vigenere.g10code.de:


More credits
============

Libgcrypt used to be part of GnuPG but has been taken out into its own
package on 2000-12-21.

Most of the stuff in mpi has been taken from an old GMP library
version by Torbjorn Granlund <tege@noisy.tmg.se>.

The files cipher/rndunix.c and cipher/rndw32.c are based on those
files from Cryptlib.  Copyright Peter Gutmann, Paul Kendall, and Chris
Wedgwood 1996-1999.

The ECC code cipher/ecc.c was based on code by Sergi Blanch i Torne,
sergi at calcurco dot org.

The implementation of the Camellia cipher has been been taken from the
original NTT provided GPL source.

The CAVS testing program tests/cavs_driver.pl is not to be considered
a part of libgcrypt proper.  We distribute it merely for convenience.
It has a permissive license and is copyrighted by atsec information
security corporation.  See the file for details.

The file salsa20.c is based on D.J. Bernstein's public domain code and
taken from Nettle.  Copyright 2012 Simon Josefsson and Niels Möller.


 This file is free software; as a special exception the author gives
 unlimited permission to copy and/or distribute it, with or without
 modifications, as long as this notice is preserved.

 This file is distributed in the hope that it will be useful, but
 WITHOUT ANY WARRANTY, to the extent permitted by law; without even the
 implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
8X---------------------------------------------------

License:

Most of the package is licensed under the GNU Lesser General Public
License (LGPL) version 2.1 (or later), except for helper and debugging
binaries. See below for details. The documentation is licensed under
the GPLv2 (or later), see below.

Excerpt from upstream's README:

    The library is distributed under the terms of the GNU Lesser
    General Public License (LGPL); see the file COPYING.LIB for the
    actual terms.

    The helper programs as well as the documentation are distributed
    under the terms of the GNU General Public License (GPL); see the
    file COPYING for the actual terms.

    The file LICENSES has notices about contributions that require
    that these additional notices are distributed.

An example of the license headers of the LGPL is

-------------
   Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2006
                 2007, 2008, 2009, 2010, 2011  Free Software Foundation, Inc.

   This file is part of Libgcrypt.

   Libgcrypt 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 2.1 of
   the License, or (at your option) any later version.

   Libgcrypt 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, see <http://www.gnu.org/licenses/>.
-------------

On Debian GNU/Linux systems, the complete text of the GNU Lesser
General Public License can be found in
`/usr/share/common-licenses/LGPL';

The documentation licensed under the GPL
-------------
Copyright @copyright{} 2000, 2002, 2003, 2004, 2006, 2007, 2008, 2009, 2011, 2012 Free Software Foundation, Inc. @*
Copyright @copyright{} 2012, 2013, 2016 2017 g10 Code GmbH

@quotation
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2 of the License, or (at your
option) any later version. The text of the license can be found in the
section entitled ``GNU General Public License''.
-------------

Further details on licensing:
From upstream's LICENSES file
8X---------------------------------------------------
Additional license notices for Libgcrypt.                    -*- org -*-

This file contains the copying permission notices for various files in
the Libgcrypt distribution which are not covered by the GNU Lesser
General Public License (LGPL) or the GNU General Public License (GPL).

These notices all require that a copy of the notice be included
in the accompanying documentation and be distributed with binary
distributions of the code, so be sure to include this file along
with any binary distributions derived from the GNU C Library.

* BSD_3Clause

  For files:
  - cipher/sha256-avx-amd64.S
  - cipher/sha256-avx2-bmi2-amd64.S
  - cipher/sha256-ssse3-amd64.S
  - cipher/sha512-avx-amd64.S
  - cipher/sha512-avx2-bmi2-amd64.S
  - cipher/sha512-ssse3-amd64.S
  - cipher/sha512-ssse3-i386.c

#+begin_quote
  Copyright (c) 2012, Intel Corporation

  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 Intel Corporation nor the names of its
    contributors may be used to endorse or promote products derived from
    this software without specific prior written permission.


  THIS SOFTWARE IS PROVIDED BY INTEL CORPORATION "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 INTEL CORPORATION 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.
#+end_quote

  For files:
  - random/jitterentropy-base.c
  - random/jitterentropy-gcd.c
  - random/jitterentropy-gcd.h
  - random/jitterentropy-health.c
  - random/jitterentropy-health.h
  - random/jitterentropy-noise.c
  - random/jitterentropy-noise.h
  - random/jitterentropy-sha3.c
  - random/jitterentropy-sha3.h
  - random/jitterentropy-timer.c
  - random/jitterentropy-timer.h
  - random/jitterentropy.h
  - random/rndjent.c (plus common Libgcrypt copyright holders)

#+begin_quote
 Copyright (C) 2017 - 2021, Stephan Mueller <smueller@chronox.de>

 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions
 are met:
 1. Redistributions of source code must retain the above copyright
    notice, and the entire permission notice in its entirety,
    including the disclaimer of warranties.
 2. 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.
 3. The name of the author may not be used to endorse or promote
    products derived from this software without specific prior
    written permission.

 ALTERNATIVELY, this product may be distributed under the terms of
 the GNU General Public License, in which case the provisions of the GPL2
 are required INSTEAD OF the above restrictions.  (This clause is
 necessary due to a potential bad interaction between the GPL and
 the restrictions contained in a BSD-style copyright.)

 THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ALL OF
 WHICH ARE HEREBY DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR 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 NOT ADVISED OF THE POSSIBILITY OF SUCH
 DAMAGE.
#+end_quote

  For files:
  - cipher/cipher-gcm-ppc.c

#+begin_quote
 Copyright (c) 2006, CRYPTOGAMS by <appro@openssl.org>
 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 copyright notices,
         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 CRYPTOGAMS nor the names of its
         copyright holder and contributors may be used to endorse or
         promote products derived from this software without specific
         prior written permission.

 ALTERNATIVELY, provided that this notice is retained in full, this
 product may be distributed under the terms of the GNU General Public
 License (GPL), in which case the provisions of the GPL apply INSTEAD OF
 those given above.

 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER 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.
#+end_quote

* X License

  For files:
  - install.sh

#+begin_quote
  Copyright (C) 1994 X Consortium

  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
  X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNEC-
  TION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

  Except as contained in this notice, the name of the X Consortium shall not
  be used in advertising or otherwise to promote the sale, use or other deal-
  ings in this Software without prior written authorization from the X Consor-
  tium.
#+end_quote

* Public domain

  For files:
  - cipher/arcfour-amd64.S

#+begin_quote
 Author: Marc Bevand <bevand_m (at) epita.fr>
 Licence: I hereby disclaim the copyright on this code and place it
 in the public domain.
#+end_quote

* OCB license 1

  For files:
  - cipher/cipher-ocb.c

#+begin_quote
  OCB is covered by several patents but may be used freely by most
  software.  See http://web.cs.ucdavis.edu/~rogaway/ocb/license.htm .
  In particular license 1 is suitable for Libgcrypt: See
  http://web.cs.ucdavis.edu/~rogaway/ocb/license1.pdf for the full
  license document; it basically says:

    License 1 — License for Open-Source Software Implementations of OCB
                (Jan 9, 2013)

    Under this license, you are authorized to make, use, and
    distribute open-source software implementations of OCB. This
    license terminates for you if you sue someone over their
    open-source software implementation of OCB claiming that you have
    a patent covering their implementation.



 License for Open Source Software Implementations of OCB
 January 9, 2013

 1 Definitions

 1.1 “Licensor” means Phillip Rogaway.

 1.2 “Licensed Patents” means any patent that claims priority to United
 States Patent Application No. 09/918,615 entitled “Method and Apparatus
 for Facilitating Efficient Authenticated Encryption,” and any utility,
 divisional, provisional, continuation, continuations-in-part, reexamination,
 reissue, or foreign counterpart patents that may issue with respect to the
 aforesaid patent application. This includes, but is not limited to, United
 States Patent No. 7,046,802; United States Patent No. 7,200,227; United
 States Patent No. 7,949,129; United States Patent No. 8,321,675 ; and any
 patent that issues out of United States Patent Application No. 13/669,114.

 1.3 “Use” means any practice of any invention claimed in the Licensed Patents.

 1.4 “Software Implementation” means any practice of any invention
 claimed in the Licensed Patents that takes the form of software executing on
 a user-programmable, general-purpose computer or that takes the form of a
 computer-readable medium storing such software. Software Implementation does
 not include, for example, application-specific integrated circuits (ASICs),
 field-programmable gate arrays (FPGAs), embedded systems, or IP cores.

 1.5 “Open Source Software” means software whose source code is published
 and made available for inspection and use by anyone because either (a) the
 source code is subject to a license that permits recipients to copy, modify,
 and distribute the source code without payment of fees or royalties, or
 (b) the source code is in the public domain, including code released for
 public use through a CC0 waiver. All licenses certified by the Open Source
 Initiative at opensource.org as of January 9, 2013 and all Creative Commons
 licenses identified on the creativecommons.org website as of January 9,
 2013, including the Public License Fallback of the CC0 waiver, satisfy these
 requirements for the purposes of this license.

 1.6 “Open Source Software Implementation” means a Software
 Implementation in which the software implicating the Licensed Patents is
 Open Source Software. Open Source Software Implementation does not include
 any Software Implementation in which the software implicating the Licensed
 Patents is combined, so as to form a larger program, with software that is
 not Open Source Software.

 2 License Grant

 2.1 License. Subject to your compliance with the term s of this license,
 including the restriction set forth in Section 2.2, Licensor hereby
 grants to you a perpetual, worldwide, non-exclusive, non-transferable,
 non-sublicenseable, no-charge, royalty-free, irrevocable license to practice
 any invention claimed in the Licensed Patents in any Open Source Software
 Implementation.

 2.2 Restriction. If you or your affiliates institute patent litigation
 (including, but not limited to, a cross-claim or counterclaim in a lawsuit)
 against any entity alleging that any Use authorized by this license
 infringes another patent, then any rights granted to you under this license
 automatically terminate as of the date such litigation is filed.

 3 Disclaimer
 YOUR USE OF THE LICENSED PATENTS IS AT YOUR OWN RISK AND UNLESS REQUIRED
 BY APPLICABLE LAW, LICENSOR MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY
 KIND CONCERNING THE LICENSED PATENTS OR ANY PRODUCT EMBODYING ANY LICENSED
 PATENT, EXPRESS OR IMPLIED, STATUT ORY OR OTHERWISE, INCLUDING, WITHOUT
 LIMITATION, WARRANTIES OF TITLE, MERCHANTIBILITY, FITNESS FOR A PARTICULAR
 PURPOSE, OR NONINFRINGEMENT. IN NO EVENT WILL LICENSOR BE LIABLE FOR ANY
 CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
 ARISING FROM OR RELATED TO ANY USE OF THE LICENSED PATENTS, INCLUDING,
 WITHOUT LIMITATION, DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, PUNITIVE
 OR SPECIAL DAMAGES, EVEN IF LICENSOR HAS BEEN ADVISED OF THE POSSIBILITY OF
 SUCH DAMAGES PRIOR TO SUCH AN OCCURRENCE.
#+end_quote
8X---------------------------------------------------


On Debian GNU/Linux systems, the text of the GNU General Public License,
version 2 can be found in `/usr/share/common-licenses/GPL-2'.