Please see the LICENSE file in each top-level directory for the terms applicable to that directory and its relative sub-directories.

The relevant directories and licenses are:

src/                  - BSD-2-Clause; see src/LICENSE for details
include/              - CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
polyfill/clang/       - MIT; see the header of polyfill/clang/stdatomic.h for details