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)
The 5 Rs of OER: The real power of OER comes in the “5R Permissions” that entitle you to not only access these materials free of charge, but also to make them better.