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The actual contents of the file can be viewed below.

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Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: Libidn
Upstream-Contact: Simon Josefsson <simon@josefsson.org>
Source: https://www.gnu.org/software/libidn/

Files: *
Copyright: Copyright (C) 2002-2012  Simon Josefsson
License: GPL-3+
 The command-line tools, the build environment, the self-tests, the
 Emacs Lisp code, and the examples are licensed under the GPLv3+.  For
 example quoting src/idn.c:
 .
 * idn.c --- Command line interface to libidn.
 * Copyright (C) 2003-2012 Simon Josefsson
 *
 * This file is part of GNU Libidn.
 *
 * This program 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 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 .
 On Debian systems, the full text of the GNU General Public License
 version 3 can be found in the `/usr/share/common-licenses/GPL-3'
 file.

Files: doc/libidn.texi
Copyright: Copyright 2002-2012 Simon Josefsson.
License: GFDL-1.3+
 This is the manual, licensed under GFDLv1.3+, quoting the file:
 .
  Copyright @copyright{} 2002-2012 Simon Josefsson.
 .
  Permission is granted to copy, distribute and/or modify this document
  under the terms of the GNU Free Documentation License, Version 1.3 or
  any later version published by the Free Software Foundation; with no
  Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.  A
  copy of the license is included in the section entitled ``GNU Free
  Documentation License''.
 .
 On Debian systems, the complete text of the GNU Free Documentation
 License Version 1.3 can be found in the file
 `/usr/share/common-licenses/GFDL-1.3'.

Files: csharp/*
Copyright: Copyright (C) 2004-2012 Free Software Foundation, Inc.
License: LGPL-3+ or GPL-2+
 The C# library is dual-licensed under LGPLv3+ and GPLv2+.  For
 example quoting csharp/IDNA.cs:
 .
 // Copyright (C) 2004-2012 Free Software Foundation, Inc.
 //
 // Author: Alexander Gnauck AG-Software, mailto:gnauck@ag-software.de
 //
 // This file is part of GNU Libidn.
 //
 // GNU Libidn is free software: you can redistribute it and/or
 // modify it under the terms of either:
 //
 //   * 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.
 //
 // or
 //
 //   * 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.
 //
 // or both in parallel, as here.
 //
 // GNU Libidn 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 copies of the GNU General Public License and
 // the GNU Lesser General Public License along with this program.  If
 // not, see <http://www.gnu.org/licenses/>.
 .
 On Debian systems, the full text of the GNU Lesser General Public
 License version 3.0 can be found in the
 `/usr/share/common-licenses/LGPL-3' file, and the full text of the
 GNU General Public License version 2.0 can be found in the
 `/usr/share/common-licenses/GPL-2' file.

Files: java/*
Copyright: Copyright (C) 2004-2007  Free Software Foundation, Inc.
License: LGPL-3+ or GPL-2+
 The Java library is dual-licensed under LGPLv3+ and GPLv2+.  For
 example quoting java/gnu/inet/encoding/IDNA.java:
 .
   Copyright (C) 2004-2012 Free Software Foundation, Inc.
   Author: Oliver Hitz
 .
   This file is part of GNU Libidn.
 .
   GNU Libidn is free software: you can redistribute it and/or
   modify it under the terms of either:
 .
     * 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.
 .
   or
 .
     * 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.
 .
   or both in parallel, as here.
 .
   GNU Libidn 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 copies of the GNU General Public License and
   the GNU Lesser General Public License along with this program.  If
   not, see <http://www.gnu.org/licenses/>.

Files: gl/* gltests/* build-aux/* GNUmakefile maint.mk
Copyright: Copyright (C) 2007 Free Software Foundation, Inc.
License: GPL-3+
 These files are copied from gnulib, and the copyright is normally
 held by Free Software Foundation, Inc.  For example gl/strerror.c:
 .
   Copyright (C) 2007-2012 Free Software Foundation, Inc.
 .
   This program 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 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.
 .
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.

Files: lib/*
Copyright: Copyright (C) 2002-2012  Simon Josefsson
License: LGPL-3+ or GPL-2+
 The C library is dual-licensed under LGPLv3+ and GPLv2+.  For
 example quoting lib/stringprep.c:
 .
   Copyright (C) 2002-2012 Simon Josefsson
 .
   This file is part of GNU Libidn.
 .
   GNU Libidn is free software: you can redistribute it and/or
   modify it under the terms of either:
 .
     * 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.
 .
   or
 .
     * 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.
 .
   or both in parallel, as here.
 .
   GNU Libidn 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 copies of the GNU General Public License and
   the GNU Lesser General Public License along with this program.  If
   not, see <http://www.gnu.org/licenses/>.

Files: lib/gen-unicode-tables.pl
Copyright: Copyright (C) 2004, 2005, 2006, 2007, 2008 Simon Josefsson
           Copyright (C) 1998, 1999 Tom Tromey
           Copyright (C) 2001 Red Hat Software
License: GPL-3+
 This file is originally from glib, quoting the file:
 .
 #    Copyright (C) 2004-2012 Simon Josefsson
 #    Copyright (C) 1998, 1999 Tom Tromey
 #    Copyright (C) 2001 Red Hat Software
 .
 # This program 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 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.
 #
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 .
 # I consider the output of this program to be unrestricted.  Use it as
 # you will.

Files: lib/punycode.?
Copyright: Copyright (C) 2002-2015 Simon Josefsson
License: LGPL-3+ or GPL-2+
 This file was originally written by Adam M. Costello and is released
 under the following license -- see http://www.nicemice.net/idn/
 .
 * Disclaimer and license: Regarding this entire document or any
 * portion of it (including the pseudocode and C code), the author
 * makes no guarantees and is not responsible for any damage resulting
 * from its use.  The author grants irrevocable permission to anyone
 * to use, modify, and distribute it in any way that does not diminish
 * the rights of anyone else to use, modify, and distribute it,
 * provided that redistributed derivative works do not contain
 * misleading author or version information.  Derivative works need
 * not be licensed under similar terms.
 .
 The file has been modified and is now distributed under dual LGPLv3+
 and GPLv2+, quoting the file:
 .
   Copyright (C) 2002-2015 Simon Josefsson
 .
   This file is part of GNU Libidn.
 .
   GNU Libidn is free software: you can redistribute it and/or
   modify it under the terms of either:
 .
     * 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.
 .
   or
 .
     * 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.
 .
   or both in parallel, as here.
 .
   GNU Libidn 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 copies of the GNU General Public License and
   the GNU Lesser General Public License along with this program.  If
   not, see <http://www.gnu.org/licenses/>.

Files: lib/nfkc.c
Copyright: Copyright (C) 2002, 2003, 2004, 2006, 2007,
                         2008, 2009  Simon Josefsson
           Copyright (C) 1999, 2000 Tom Tromey
           Copyright 2000 Red Hat, Inc.
License: LGPL-3+ or GPL-2+
 This file contains some functions derived from glib under LGPLv2+ but
 the entire file uses the dual LGPLv3+ and GPLv2+ license, quoting the file:
 .
   Copyright (C) 2002-2012 Simon Josefsson
 .
   This file is part of GNU Libidn.
 .
   GNU Libidn is free software: you can redistribute it and/or
   modify it under the terms of either:
 .
     * 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.
 .
   or
 .
     * 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.
 .
   or both in parallel, as here.
 .
   GNU Libidn 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 copies of the GNU General Public License and
   the GNU Lesser General Public License along with this program.  If
   not, see <http://www.gnu.org/licenses/>.
 .
 /* Code from GLIB gmacros.h starts here. */
 .
 /* GLIB - Library of useful routines for C programming
  * Copyright (C) 1995-1997  Peter Mattis, Spencer Kimball and Josh MacDonald
  *
  * This library 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 of the License, or (at your option) any later version.
  *
  * This library 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.
 .
 /* Code from GLIB gunicode.h starts here. */
 .
 /* gunicode.h - Unicode manipulation functions
  *
  *  Copyright (C) 1999, 2000 Tom Tromey
  *  Copyright 2000, 2005 Red Hat, Inc.
  *
  * The Gnome Library 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 of the
  * License, or (at your option) any later version.
  *
  * The Gnome Library 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.
 .
 /* Code from GLIB gutf8.c starts here. */
 .
 /* gutf8.c - Operations on UTF-8 strings.
  *
  * Copyright (C) 1999 Tom Tromey
  * Copyright (C) 2000 Red Hat, Inc.
  *
  * This library 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 of the License, or (at your option) any later version.
  *
  * This library 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.
 .
 /* Code from GLIB gunidecomp.c starts here. */
 .
 /* decomp.c - Character decomposition.
  *
  *  Copyright (C) 1999, 2000 Tom Tromey
  *  Copyright 2000 Red Hat, Inc.
  *
  * The Gnome Library 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 of the
  * License, or (at your option) any later version.
  *
  * The Gnome Library 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.
 .
 On Debian systems, the full text of the GNU Lesser General Public
 License version 2 can be found in the
 `/usr/share/common-licenses/LGPL-2' file.

Files: lib/gl/* lib/gltests/*
Copyright: Copyright (C) 2007 Free Software Foundation, Inc.
License: LGPL-2.1+
 These files are copied from gnulib, and the copyright is normally
 held by Free Software Foundation, Inc.  For example lib/gl/strverscmp.c:
 .
   Copyright (C) 1997, 2000, 2002, 2004, 2006, 2009-2012 Free Software
   Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Jean-François Bignolles <bignolle@ecoledoc.ibp.fr>, 1997.
 .
   This program 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, or (at your option)
   any later version.
 .
   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 Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  .
 On Debian systems, the full text of the GNU Lesser General Public
 License version 2.1 can be found in the
 `/usr/share/common-licenses/LGPL-2.1' file.

Files: doc/gdoc
Copyright: Copyright (c) 2002-2012 Simon Josefsson
           Copyright (c) 2001, 2002 Nikos Mavrogiannopoulos
           Copyright (c) 1998 Michael Zucchi
License: GPL-3+
 This tool is used to generate texinfo snippets and man pages from the
 source code.
 .
 # This program 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 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.
 #
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.

Files: doc/man/*
Copyright: Copyright © 2002-2012 Simon Josefsson.
License: GAP
 These are the auto-generated man pages.  For example doc/man/stringprep.3:
 .
  Copyright © 2002-2012 Simon Josefsson.
  Copying  and  distribution  of this file, with or without modification,
  are permitted in any medium  without  royalty  provided  the  copyright
  notice and this notice are preserved.