Short version for non-lawyers:
The Rust Project is dual-licensed under Apache 2.0 and MIT
terms.
Longer version:
The Rust Project is copyright 2014, The Rust Project
Developers (given in the file AUTHORS.txt).
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. All files in the project carrying such
notice may not be copied, modified, or distributed except
according to those terms.