Copyrights in the "group" library are retained by their contributors. No copyright assignment is required to contribute to the "group" library. The "group" library is licensed under either of * Apache License, Version 2.0, (see ./LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0) * MIT license (see ./LICENSE-MIT or http://opensource.org/licenses/MIT) at your option. Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.