LICENSE

mapnik-render-image is free software: you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.

Disclaimer: generate_image.py didn't have a specified license, but as it
is past of a large free software project, it is assumed that the
original developers had the GNU GPL in mind. If you are one of those
authors and feel aggrieved, please contact the new author on Github.