Short version for non-lawyers: The combine-proc-macro crate is dual-licensed under Apache 2.0 and MIT terms. Longer version: Copyrights in this library are retained by their contributors. No copyright assignment is required to contribute to the library. Except as otherwise noted (below and/or in individual files), the library is licensed under the Apache License, Version 2.0 or or the MIT license or , at your option. This library may include packages written by third parties which carry their own copyright notices and license terms.