License

cca is released under the GNU General Public License, version 3.0.

The full text is in LICENSE, and the canonical copy is at gnu.org.

What this means in practice

You are free to:

• use it for anything, including commercially;
• study it and change it;
• share it; and
• share your changes.

In return, if you distribute cca or a derivative — modified or not — you must:

• release it under the same GPL-3.0 license;
• make the complete corresponding source available to whoever receives it;
• state what you changed; and
• preserve the copyright and license notices.

Running it is not distributing it

Using cca internally, however heavily and however modified, triggers no obligation. The copyleft terms apply when you distribute the software to someone else.

No warranty

As set out in sections 15 and 16 of the license, cca comes with no warranty of any kind. Given that it reports figures about money, that is worth reading rather than skimming — and worth remembering alongside Accuracy and limits.

Contributing

Contributions are accepted under the same license. By opening a pull request you agree that your contribution may be distributed under GPL-3.0.