TreeView X 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 2 of the License, or
  (at your option) any later version.

  TreeView X 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

TreeView X has been released by its author under the GNU GPL (see COPYING), but
most of its files use a header which places them under the GNU Library GPL
(LGPL). The author of TreeView X confirmed to the maintainer of this package
that his intention is to have TreeView X released under the GPL. Therefore, as
permitted the clause 3 of the LGPL, the licence of these files is changed to
the GPL through the patch in the following file:
debian/patches/60_LGPLtoGPL.patch

Some files which are part of TreeView X - namely ntree.h, ntree.cpp and
lcaquery.cpp - have no copyright notice. The author of TreeView X confirmed to
the maintainer of this package that he is the copyright holder for them.
Therefore, they are distributed under the terms of the COPYING file, which is
the GNU GPL.

On Debian systems, the complete text of the GNU Library General Public
License can be found in ‘/usr/share/common-licenses/LGPL-2’ and the
complete text of the GNU General Public License version 2 can be found
in ‘/usr/share/common-licenses/GPL-2’.