“Open Educational Resources are teaching, learning and research materials in any medium – digital or otherwise – that reside in the public domain or have been released under an open license that permits no-cost access, use, adaptation and redistribution by others with no or limited restrictions."
- William and Flora Hewlett Foundation
"5Rs image" by David Wiley, Lumen Learning is licensed under CC BY 4.0
CC BY 4.0, from The Council of Chief State School Officers
