"OER are teaching, learning, and research resources that reside in the public domain or have been released under an intellectual property license that permits their free use and re-purposing by others. Open educational resources include full courses, course materials, modules, textbooks, streaming videos, tests, software, and any other tools, materials, or techniques used to support access to knowledge."
- definition from The William and Flora Hewlett Foundation
Free the Textbook Owl by Corrina Ulrich is licensed under a Creative Commons Attribution 4.0 International License and is freely available to copy, alter, and share.