It looks like you're using Internet Explorer 11 or older. This website works best with modern browsers such as the latest versions of Chrome, Firefox, Safari, and Edge. If you continue with this browser, you may see unexpected results.
This one page introductory guide differentiates OER and OA materials on the basis of purpose (teaching vs. research), method of access (analog and digital), and in terms of the relative freedoms offered by different levels of Creative Commons licenses, the most common open license.
A playlist that acts as a mini-course on open education resources (OER). It covers reasons behind Open education, some examples of OER projects and some research associated with OER. - By Martin Weller
Texas Learn OER includes information on understanding OER; open licensing, including Creative Commons; finding and evaluating OER; accessibility; adapting, creating, and sharing OER; and OER policy and practice in Texas.