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Open Educational Resources (OER) is defined by the United Nations Educational, Scientific, and Cultural Organization (UNESCO) as:
..."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." Source: What are Open Educational Resources (OERs)?
5Rs of OER
Retain
the right to make, own, and control copies of the content
Reuse
the right to 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
the right to adapt, adjust, modify, or alter the content itself (e.g., translate the content into another language)
Remix
the right to combine the original or revised content with other open content to create something new (e.g., incorporate the content into a mashup)
Redistribute
the right to share copies of the original content, your revisions, or your remixes with others (e.g., give a copy of the content to a friend)