# License

```
marching-squares
Portions Copyright (c) 2015, 2015 Ronny Lorenz <ronny@tbi.univie.ac.at>
Portions Copyright (c) 2024 James Beard <james@smallsaucepan.com>

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

marching-squares 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 Affero General Public License for more details.

As additional permission under GNU Affero General Public License version 3
section 7, third-party projects (personal or commercial) may distribute,
include, or link against UNMODIFIED VERSIONS of marching-squares without the
requirement that said third-party project for that reason alone becomes
subject to any requirement of the GNU Affero General Public License version 3.
Any modifications to marching-squares, however, must be shared with the public
and made available.

In summary this:
- allows you to use marching-squares at no cost
- allows you to use marching-squares for both personal and commercial purposes
- allows you to distribute UNMODIFIED VERSIONS of marching-squares under any
  license as long as this license notice is included
- enables you to keep the source code of your program that uses marching-squares
  undisclosed
- forces you to share any modifications you have made to marching-squares,
  e.g. bug-fixes

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