Why OER Matter - introductory video (2:09 min). Attribution: Brendan Walsh, Wikimedia Commons
Open Educational Resources (OER) 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.” - UNESCO , Paris Declaration, 2012.
encompasses resources, tools and practices that employ a framework of open sharing to improve educational access and effectiveness worldwide." - Open Education Consortium
"Open Educational Resources (OER) provide teachers, learners, and others with legal permissions to engage in the 5R activities." The 5R Permissions of OER Defined. (Source: Lumen)
Image source: Flickr