Short version for non-lawyers:

The iceray project is licensed under Apache 2.0 terms.


Longer version:

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

For full authorship information, see the version control history.

iceray is licensed under the Apache License, Version 2.0 <LICENSE>
or <http://www.apache.org/licenses/LICENSE-2.0>, at your option.