A defining part of OER is that the content either exists in the public domain or has been released under a license that permits reuse and adaptation. Not all free resources are actually OER and it is important to be aware of this distinction as you consider how you want to create, reuse, and adapt educational resources.
Dr. David Wiley developed the 5Rs framework to explain and remember permissions granted by an open license. This framework is a good guideline and if you are able to practice the 5Rs with a resource it can be considered OER. The 5Rs outline that users have the right to do the following:
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 mash-up)
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)