Open Educational Resources (OER) are teaching, learning, and research resources that are free of cost and access barriers. OER carry legal permission for open use.* They include a multitude of formats, including textbooks, full courses, modules, videos, labs, assignments, and assessments.
OER are licensed in such a way that enables adopters to utilize the 5 Rs:
Creative Commons licenses are often applied to OER to license these rights to adopters.