The majority of KiCad's source code is developed and distributed under the terms
of the GPLv3 or later. However, It does include some third-party code licensed
under AGPLv3 or later.

Both licenses are compatible, but a combined works as is will be governed under
the terms of the AGPLv3 (or later). This includes any binary distribution of the
KiCad EDA suite by the KiCad project or any third party, e.g. Linux distributor.

You are free to use the *sources* under the terms of their respective licenses.

Licensed under AGPLv3 (or later):
- TTL [https://www.sintef.no/projectweb/geometry-toolkits/ttl/], sources in include/ttl/*
Licensed under GPLv3 (or later):