Short version for non-laywers:
The utime project is dual-licensed under Apache 2.0 and MIT terms.
Longer version:
Copyright 2015-2018 Hyeon Kim
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. This file may not be copied, modified, or distributed
except according to those terms.