Open Educational Resources (OER) are defined as "born digital content made available for free or for a nominal fee in a range of formats, including textbooks, games, media, and instructional readings. OER are freely available online and can be used in learning management systems and accessed multiple times across various devices by an unlimited number of simultaneous users. They can be shared and their content remixed and repurposed by authors and users. Authors of OER materials maintain their rights to their work and use Creative Commons licensing terms or a similar type of agreement to share them."
source: Okamoto, Karen. "Making Higher Education More Affordable, One Course Reading at a Time: Academic Libraries as Key Advocates for Open Access Textbooks and Educational Resources." Public Services Quarterly 9.4 (2013): 267-283 LISTA. Web. 28 Oct. 2015