This software is licensed under the GNU General Public License (GPL) version 2, June 1991.
Later/other versions of the GPL do not cover the use of this software!
This basically means you're free to use the software for any purpose. However, making changes to the source code requires you to make those changes publicly available, preferably to the original author.
It also means the author can not be held responsible in any way whatsoever for anything that might happen as a result of using the software.