The Gephi Consortium elects to use only the GNU General Public License version 3 (GPL) for any software where a choice of GPL license versions are made available with the language indicating that GPLv3 or any later version may be used, or where a choice of which version of the GPL is applied is unspecified.

For more information on the license please see: the Gephi License FAQs.

License headers are avaible on http://www.opensource.org/licenses/CDDL-1.0 and http://www.gnu.org/licenses/gpl.html.