Renpurchase is under the MIT license.

Per <CAGvzibYnXefoeD8FgvJ+EyXq9KQVpKEyWKzRCPwSvNfkEDbafg@mail.gmail.com>
and <CANdAuzeVyFwfjxq-j3dnt3C7rW0B6RASohR1VRxMYe0+WTr01Q@mail.gmail.com>.

Thanks to Emmanuel Marty and Riva Celso for contributing this code.