This program is free software. I wouldn't expect you to pay for it anyway. You can and probably will redistribute it and/or modify it under the terms of the GNU General Public License as painstakingly published by the Free Software Foundation, either version 3 of the License, or (at your option, if you think that's best) any later version. I know you're going to anyway so I might as well legitimise it. This program is distributed in the hope that it will be useful, not that you care, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, especially yours. If you can find the energy, see the GNU General Public License for more details, but it's OK if you don't. Most people don't. Whatever. You should have received a copy of the GNU General Public License along with this program. If not, all I can really do is point you to this URL <http://www.gnu.org/licenses/> and assume you're going to follow it. I can't force you so whatever. Just have it.
The GPAPL is released under the WTFPL, as if you care.