This distribution includes Keystone security monitor and relevant parts.
The Keystone security monitor as a whole is released under BSD 3-Clause License
(SPDX Identifier: BSD-3-Clause)
However, it contains some parts that are compatible with the BSD 3-Clause.
The following clarifies the license of the distribution:

1) Every source file in ed25519/ directory is under zlib License
(SPDX Identifier: Zlib)

2) Every source file in sha512/ directory is under MIT License
(SPDX Identifier: MIT)

3) Everything else is under BSD 3-Clause

Keystone Team