Short version for non-lawyers:

The Temper Project code is dual-licensed under Apache 2.0 and MIT terms.

The Temper Project documentation is licensed under a Creative Commons
license: CC-BY-SA-4.0.

Both are Copyright (c) The Temper Project Contributors.

Longer version:

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

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

Except as otherwise noted, Temper is licensed under the Apache
License, Version 2.0 <LICENSE-APACHE> or <https://www.apache.org/licenses/LICENSE-2.0>
or the MIT license <LICENSE-MIT> or <https://opensource.org/licenses/MIT>,
at your option.

Tempest, the Rust implementation of Temper, is part of the Temper project
and under the same terms. Third-party materials it includes, such as
Unicode data, are listed with their notices in NOTICE.

The Temper Language Documentation is licensed under the CC-BY-SA 4.0
license <LICENSE-CC-BY-SA-4.0> or <https://creativecommons.org/licenses/by-sa/4.0/>.
That documentation is assembled from a mixture of hand written
documentation files and comments authored as documentation but
embedded in programming language source files.

Libraries written using the Temper programming language definition, or
its toolchain elements (e.g. the Temper command line tool, the Temper
VSCode plugin, and language server) are the copyright of their
creators and may or may not be licensed in the same way as the Temper
project at the discretion of their creators.