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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
Most open licensed materials use a Creative Commons license. For more information about Creative Commons licensing select the Copyright and Creative Commons tab on the left.
The 5 "R's" of OER
Open Educational Resources or OER allows adopters of OER materials to "Revise, Remix, Reuse, Re-distribute, and Retain" educational materials. These are known as the "5 R's of OER."
Retain – Make, own, and control copies of the content (e.g., download, duplicate, store, and manage)
Reuse – Use the content in a wide range of ways (e.g., in a class, in a study group, on a website, in a video)
Revise – Adapt, adjust, modify, or alter the content itself (e.g., translate the content into another language)
Remix – Combine the original or revised content with other material to create something new (e.g., incorporate the content into a mashup)
Redistribute – Share copies of the original content, your revisions, or your remixes with others (e.g., give a copy of the content to a friend)