source: releases/0.9.0/LICENSE @ 135

                    GNU GENERAL PUBLIC LICENSE
                       Version 3, 29 June 2007

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The hypothetical commands `show w' and `show c' should show the appropriate
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  The GNU General Public License does not permit incorporating your program
into proprietary programs.  If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library.  If this is what you want to do, use the GNU Lesser General
Public License instead of this License.  But first, please read
<http://www.gnu.org/philosophy/why-not-lgpl.html>.