Short version for non-lawyers:

This project is dual-licensed under Apache 2.0 and MIT terms.

Longer version:

Copyrights in this project are retained by their contributors. No copyright assignment is required to contribute to this project.

Some files include explicit copyright notices and/or license notices. For full authorship information, see the version control history.

Except as otherwise noted (below and/or in individual files), this project is 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.