# Licensing

Concat is copyright Jareer Abdullah, who offers it under two licences.

## 1. AGPL-3.0-or-later

The source in this repository, and every release built from it, is licensed
under the [GNU Affero General Public License, version 3 or later](LICENSE).
You may use, study, change and share Concat under that licence's terms. If you
distribute Concat, or a work based on it, or let people use a modified version
over a network, you must offer them its complete source under the same
licence.

## 2. Commercial licence

For anyone who cannot or will not meet the AGPL's terms, for example to ship
Concat or its engine inside a closed-source product, to keep changes private,
or to build on it without passing the licence on, Concat is available under a
separate commercial licence, agreed in writing with its owner.

To ask about one, email [jub0trd@gmail.com](mailto:jub0trd@gmail.com).

Only a written agreement signed by the owner grants a commercial licence.
Nothing in this repository, its issues, pull requests or discussions does.

A commercial licence says, in writing, what it covers.

## Codec patents

Neither licence grants any rights under patents on media formats such as
H.264, HEVC or AAC. Concat encodes and decodes those formats through the
operating system's and the hardware's own codecs where it can, which their
makers license; anyone who distributes Concat, or builds on it, is
responsible for any patent licences their own use requires.

## Third-party components

Concat includes and links third-party software, fonts and models, listed in
[`THIRD_PARTY_NOTICES.md`](THIRD_PARTY_NOTICES.md). Each keeps its own licence,
and neither of the licences above covers it. Some of them (Slint under its
GPL-3.0 option, and the Robust Video Matting weights, which are GPL-3.0 and
downloaded on demand) cannot go into a closed-source build as they are; a
commercial licence says how each is handled. The FFmpeg builds Concat ships
are LGPL, which a closed-source build may link if its users can relink it
against their own FFmpeg.

## Contributions

Contributions come in under the MIT No Attribution licence, with a sign-off;
[`CLA.md`](CLA.md) has the terms. That licence lets anyone use a contribution
for anything, so both licences above can cover it, and contributors keep
their copyright and every right to use their own work.

## The name

Neither licence grants rights in the Concat name or logo. See
[`TRADEMARK.md`](TRADEMARK.md).