https://raw.githubusercontent.com/jedisct1/rust-siphash/HEAD/COPYING:

Copyright 2012-2016 The Rust Project Developers.
Copyright 2016-2021 Frank Denis.

Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
<LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
option.