LICENSE-academic.txt

The Voreen software package is Copyright (C) 2005-2013 University of Muenster, Germany,
Visualization and Computer Graphics Group, Department of Computer Science.

You may use, distribute and copy the Voreen software package under the terms
of the GNU General Public License version 2, see the file "LICENSE.txt".

In addition, as a special exception, the copyright holders of Voreen give you
permission to copy and distribute a work based on the Voreen software package in
object code or executable form without the requirement to accompany it with the
source code, provided that you meet all of these conditions:

a) You use Voreen in an academic environment for research or teaching purposes
   and distribute it without any monetary gain.

b) You acknowledge the use of Voreen and its authors in your software and the
   accompanying documentation as well as in any related publication.

If you are unsure if these conditions apply to you, please contact the authors.

Note that people who make modified versions of Voreen are not obligated to grant
this special exception for their modified versions; it is their choice whether
to do so. The GNU General Public License gives permission to release a modified
version without this exception; this exception also makes it possible to release
a modified version which carries forward this exception.