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/usr/share/doc/okular-extra-backends/copyright is in okular-extra-backends 4:15.12.3-0ubuntu1.

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The actual contents of the file can be viewed below.

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This package was debianized by Ana Beatriz Guerrero Lopez <ana@debian.org> on
Tue, 22 May 2007 11:45:58 +0200.

It was downloaded from ftp://ftp.kde.org

Upstream Author: The KDE development team <kde-core-devel@kde.org>
Numerous people, too many to count, have contributed to kdelibs as a
whole. The KDE project tries to make an extensive list of people who
contributed to KDE at http://www.kde.org/people/credits/

Copyright:

    Unless something else is mentioned, copyright is
    © 1996-2009, The K Desktop Environment project http://www.kde.org

    Other copyright holders:
    Copyright © 2006-2007, 2009-2010 by Pino Toscano <pino@kde.org>
    Copyright © 2004-2005 by Enrico Ros <eros.kde@email.it>
    Copyright © 2007 by Tobias Koenig <tokoe@kde.org>
    Copyright © 2006 by Chu Xiaodong <xiaodongchu@gmail.com>
    Copyright © 2004-2006 by Albert Astals Cid <tsdgeos@terra.es>
    Copyright © 2005 by Piotr Szymanski <niedakh@gmail.com>
    Copyright © 2006 by Luigi Toscano <luigi.toscano@tiscali.it>
    Copyright © 2007 Alex Merry <huntedhacker@tiscali.co.uk>
    Copyright © 2007,2010 John Layt <john@layt.net>
    Copyright © 2004 by Antti Markus <antti.markus@starman.ee>
    Copyright © 2004 by Waldo Bastian <bastian@kde.org>
    Copyright © 2004 by Dominique Devriese <devriese@kde.org>
    Copyright © 2003 by Dirk Mueller <mueller@kde.org>
    Copyright © 2004 by Henrique Pinto <stampede@coltec.ufmg.br>
    Copyright © 2004 by Christoph Cullmann <crossfire@babylon2k.de>
    Copyright © 2003 by Laurent Montel <montel@kde.org>
    Copyright © 2003 by Andy Goossens <andygoossens@telenet.be>
    Copyright © 2003-2004 by Christophe Devriese
    Copyright © 2003 by Daniel Molkentin <molkentin@kde.org>
    Copyright © 2002 by Malcolm Hunter <malcolm.hunter@gmx.co.uk>
    Copyright © 2002 by Wilco Greven <greven@kde.org>
    Copyright © 2002 by Chris Cheney <ccheney@cheney.cx
    Copyright © 2003 by Benjamin Meyer <benjamin@csh.rit.edu>
    Copyright © 2003 by Luboš Luňák <l.lunak@kde.org>
    Copyright © 2004 by James Ots <kde@jamesots.com>
    Copyright © 2005 Rafal Rzepecki <divide@users.sourceforge.net>
    Copyright © 2006 Hamish Rodda <rodda@kde.org>
    Copyright © 2003 Scott Wheeler <wheeler@kde.org>
    Copyright © 2003 by Kurt Pfeifle
    Copyright © 2007 Alex Merry <huntedhacker@tiscali.co.uk
    Copyright © 2009 by Eike Hein <hein@kde.org>

License:

When "under GPL" is mentioned, it means GPL like this:

    | 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 version 2.
    |
    | 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 program; if not, write to the Free Software Foundation,
    | Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

    (Some files have the additional freedom of being GPLv2 or later, but
    many files are just GPLv2)

    You can find the complete text of the license GPL v2 at
    /usr/share/common-licenses/GPL-2


Files under cmake/

These files are under this license:

    | 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 copyright
    |    notice, this list of conditions and the following disclaimer.
    | 2. Redistributions in binary form must reproduce the 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.
    |
    | THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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 ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


Files under doc/

These files are under the GNU Free Documentation License v1.2

    | Permission is granted to copy, distribute and/or modify this
    | document under the terms of the GNU Free Documentation License,
    | Version 1.1 or any later version published by the Free Software
    | Foundation; with no Invariant Sections, with no Front-Cover Texts,
    | and with no Back-Cover Texts.

    The full text of the GNU Free Documentation License is available on
    Debian systems in /usr/share/common-licenses/GFDL-1.2

    As well, all the Manpages.dox included are under this license, unless
    specified otherwise.

Files under core/
    Upstream authors are:

        Pino Toscano <pino@kde.org>
        Albert Astals Cid <aacid@kde.org>
        Tobias Koenig <tokoe@kde.org>
        Piotr Szymanski <djurban@pld-dc.org>
        Enrico Ros <eros.kde@email.it>
        Harri Porten <porten@kde.org>

    License:
    These files are under the GPL v2 or later.

Files under active/
    Upstream authors are:

        Marco Martin <mart@kde.org>
        Sebastian Kügler <sebas@kde.org>

    License:
    These files are under the GPL v2 or later.

Files under conf/
    Upstream authors are:

        Pino Toscano <pino@kde.org>
        Enrico Ros <eros.kde@email.it>

    License:
    These files are under the GPL v2 or later.

Files under generators/comicbook/
    Upstream authors are:

        Tobias Koenig <tokoe@kde.org>
        David Palacio <dpalacio@orbitalibre.org>
        Pino Toscano <pino@kde.org>

    License:
    Most of the files are under the GPL v2 or later, with few exceptions listed below.

Files generators/comicbook/qnatsort.cpp and
      generators/comicbook/qnatsort.h
    Upstream author:

        Tobias Koenig <tokoe@kde.org>

    License:
    These files are released as GPL v2 or at your option GPL v3.

Files under generators/chm/
    Upstream authors are:

        Georgy Yunaev <gyunaev@ulduzsoft.com>
        Razvan Cojocaru <razvanco@gmx.net>

    License:
    These files are under the GPL v2 or later, with a few exceptions listed
    below.

The file generators/chm/kio-msits/msits.cpp

    License:
    This files is under the LGPL v2 or later.



Files under generators/djvu/
    Upstream authors are:

        Pino Toscano <pino@kde.org>

    License:
    These files are under the GPL v2 or later.

The files:
    generators/dvi/generator_dvi.cpp
    generators/dvi/dviPageInfo.h
    generators/dvi/kviewshell_export.h
    generators/dvi/kvs_debug.h
    generators/dvi/generator_dvi.h
    generators/dvi/dviPageInfo.cpp
    generators/dvi/bigEndianByteReader.h
    generators/dvi/prebookmark.h
    generators/dvi/dviexport.cpp
    generators/dvi/dviexport.h
    Upstream authors are:

        Luigi Toscano <luigi.toscano@tiscali.it>
        Stefan Kebekus <kebekus@kde.org>
        Angus Leeming

    License:
    These files are under the GPL v2 or later.

The files:
    generators/dvi/TeXFont_PK.cpp
    generators/dvi/dviFile.cpp
    generators/dvi/dviRenderer_draw.cpp
    generators/dvi/util.cpp
    generators/dvi/vf.cpp

    These files are released with a BSD-like license:
        * 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, this list of conditions and the following disclaimer.
        * 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.
        *
        * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.

The file generators/dvi/bigEndianByteReader.h
    Upstream author:

        Stefan Kebekus <kebekus@kde.org>

    License:
    These files are under the LGPL v2 or later.

Files under generators/epub/
    Upstream author:

        Ely Levy <elylevy@cs.huji.ac.il>

    License:
    These files are under the GPL v2 or later.

Files under generators/fax/
    Upstream authors are:

        Tobias Koenig <tokoe@kde.org>
        Frank D. Cringle
        Helge Deller <deller@kde.org>

    License:
    These files are under the GPL v2 or later.

Files under generators/fictionbook/
    Upstream author:

        Tobias Koenig <tokoe@kde.org>

    License:
    These files are under the GPL v2 or later.

Files under generators/kimgio/
    Upstream authors are:

        Albert Astals Cid <aacid@kde.org>
        Pino Toscano <pino@kde.org>
        Tobias Koenig <tokoe@kde.org>

    License:
    These files are under the GPL v2 or later.

Files under generators/ooo/
    Upstream authors are:

        Tobias Koenig <tokoe@kde.org>
        Brad Hards <bradh@frogmouth.net>

    License:
    These files are under the GPL v2 or later.

Files under generators/plucker/
    Upstream authors are:

        Tobias Koenig <tokoe@kde.org>
        Bill Janssen

    License:
    These files are under the GPL v2 or later.

Files under generators/poppler/
    Upstream authors are:

        Albert Astals Cid <aacid@kde.org>
        Pino Toscano <pino@kde.org>
        Enrico Ros <eros.kde@email.it>
        Fabio D'Urso <fabiodurso@hotmail.it>
        Guillermo A. Amaral B. <gamaral@kde.org>

    License:
    Most of the files are under the GPL v2 or later, with few exceptions listed below.

Files under generators/poppler/synctex/
    Upstream author:

        Copyright (c) 2008, 2009, 2010 , 2011 jerome DOT laurens AT u-bourgogne DOT fr

    License:
        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

        Except as contained in this notice, the name of the copyright holder
        shall not be used in advertising or otherwise to promote the sale,
        use or other dealings in this Software without prior written
        authorization from the copyright holder.

Files under generators/spectre/
    Upstream author:

        Albert Astals Cid <aacid@kde.org>

    License:
    These files are under the GPL v2 or later.

Files under generators/tiff/
    Upstream author:

        Pino Toscano <toscano.pino@tiscali.it>

    License:
    These files are under the GPL v2 or later.

Files under generators/tiff/
    Upstream author:

        Brad Hards <bradh@frogmouth.net>

    License:
    These files are under the GPL v2 or later.

Files under interfaces/
    Upstream authors are:

        Michel Ludwig <michel.ludwig@kdemail.net>
        Pino Toscano <pino@kde.org>

    License:
    These files are under the GPL v2 or later.

Files under shell/
    Upstream authors are:

        Wilco Greven <greven@kde.org>
        Chris Cheney <ccheney@cheney.cx>
        Benjamin Meyer <benjamin@csh.rit.edu>
        Laurent Montel <montel@kde.org>
        Luboš Luňák <l.lunak@kde.org>
        Christophe Devriese <Christophe.Devriese@student.kuleuven.ac.be>
        Albert Astals Cid <aacid@kde.org>
        Malcolm Hunter <malcolm.hunter@gmx.co.uk>
        Dominique Devriese <devriese@kde.org>
        Dirk Mueller <mueller@kde.org>
        Pino Toscano <pino@kde.org>
        Andy Goossens <andygoossens@telenet.be>

    License:
    These files are under the GPL v2 or later.

    Files released as LGPL v2:

        okular/ui/ktreeviewsearchline.cpp
        okular/ui/ktreeviewsearchline.h

Files under tests/
    Upstream author:

        Pino Toscano <pino@kde.org>

    License:
    These files are under the GPL v2 or later.

Files under ui/
    Upstream authors are:

        Pino Toscano <pino@kde.org>
        Enrico Ros <eros.kde@email.it>
        Chu Xiaodong <xiaodongchu@gmail.com>
        Albert Astals Cid <aacid@kde.org>
        Niels Ole Salscheider <niels_ole@salscheider-online.de>
        Duncan Mac-Vicar Prett <duncan@kde.org>
        Olivier Goffart <ogoffart@kde.org>
        Tobias Koenig <tokoe@kde.org>
        John Layt <john@layt.net>
        Eike Hein <hein@kde.org>

    License:
    These files are under the GPL v2 or later.

The files:
    ui/ktreeviewsearchline.h
    ui/ktreeviewsearchline.cpp

    Upstream authors are:
        Scott Wheeler <wheeler@kde.org>
        Rafal Rzepecki <divide@users.sourceforge.net>
        Hamish Rodda <rodda@kde.org>
        Pino Toscano <pino@kde.org>

You can find the complete text of the licenses in /usr/share/common-licenses.
LGPL v2:   /usr/share/common-licenses/LGPL-2
LGPL v2.1: /usr/share/common-licenses/LGPL-2.1
LGPL v3:   /usr/share/common-licenses/LGPL-3
GPL v3:    /usr/share/common-licenses/GPL-3

The Debian packaging is ©  2007-2013, Debian Qt/KDE Maintainers
<debian-qt-kde@lists.debian.org> and is licensed under the GPL,
see `/usr/share/common-licenses/GPL'.