Harvard University Gutman LibraryFrom Harvard University: Open Educational Resources (OER) are teaching, learning, and research materials--digital or print that are in the public domain or have been released under an open license that allows no-cost access, use adaptation, redistribution by others with limited or no restrictions. "Open" permissions are defined as the "5Rs":
Retain
Reuse
Revise
Remix
Redistribute
OER examples include: Syllabi, worksheets, open textbooks, lesson plans, etc.
