"Open Educational Resources (OERs) are any type of educational materials that are in the public domain or introduced with an open license. The nature of these open materials means that anyone can legally and freely copy, use, adapt and re-share them. OERs range from textbooks to curricula, syllabi, lecture notes, assignments, tests, projects, audio, video and animation."
- UNESCO website, Open Education Resources
"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."
- The William and Flora Hewlett Foundation, Open Educational Resources
Image Credit: Lumen Learning, Licensed CC BY 4.0
Read more about the 5Rs at
"The Access Compromise and the 5th R" by David Wiley