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/usr/share/doc/libgtkextra-dev/copyright is in libgtkextra-dev 3.1.1-2.

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Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: gtkextra
Source: http://sourceforge.net/projects/gtkextra/files/3.1/gtkextra-3.1.0.tar.gz/download

Files: *
Copyright: 1999-2006 Adrian E. Feiguin <adrian@ifir.ifir.edu.ar>
License: LGPL-2.0+

Files: gtkextra/gtkpsfont.* gtkextra/gtkplotps.*
Copyright: 1998 Alexander Larsson
License: LGPL-2.0+

Files: gtkextra/gtkplotdt.*
Copyright: 2001  Andy Thaller <thaller@ph.tum.de>
License: LGPL-2.0+

Files: gtkextra/gtkpsfont.* gtkextra/gtkplotps.*
Copyright: 1999 Arjan Molenaar
License: LGPL-2.0+

Files: gtkextra/gtkdirtree.c
Copyright: 2001 Chris Kuklewicz <chrisk at mit.edu>
License: LGPL-2.0+

Files: glade/glade-gtksheet-editor.c gtkextra/gtkdataentry.* 
       gtkextra/gtkdataformat.* gtkextra/gtksheetcolumn.* 
       gtkextra/gtkdatatextview.*
Copyright: 2011-2013  Fredy Paquet <fredy@opag.ch>
License: LGPL-2.0+

Files: glade/glade-gtksheet-editor.c
Copyright: 2008 Tristan Van Berkom
License: LGPL-2.1+

Files: gtkextra/gtkcheckitem.* gtkextra/gtkitementry.*
Copyright: 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
License: LGPL-2.0+

Files: glade/glade-gtksheet-editor.c
Copyright: 2008 Tristan Van Berkom <tvb@gnome.org>
           2008 Fredy Paquet <fredy@opag.ch>
License: LGPL-2.1+

Files: docs/*
Copyright: 1999-2006 Victor Mierla <victor.mierla@flash.ro>
License: GFDL-1.1 with no invariant parts

Files: debian/*
Copyright: 2014 Georges Khaznadar <georgesk@debian.org>
License: LGPL-2.0+

License: LGPL-2.0+
 This package 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.
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 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
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 You should have received a copy of the GNU General Public License
 along with this program. If not, see <http://www.gnu.org/licenses/>.
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 On Debian systems, the complete text of the GNU Lesser General
 Public License can be found in "/usr/share/common-licenses/LGPL-2".

License: LGPL-2.1+
 This package 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.
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 This package is distributed in the hope that it will be useful,
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 You should have received a copy of the GNU General Public License
 along with this program. If not, see <http://www.gnu.org/licenses/>.
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 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: GFDL-1.1 with no invariant parts
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