Open educational resources (OER) are teaching, learning, and research materials that are either (1) in the public domain or (2) licensed in a manner that provides everyone with free and perpetual permission to engage in the 5R activities:

1. Retain - make, own, and control a copy of the resource (e.g., download and keep your own copy)
2. Revise - edit, adapt, and modify your copy of the resource (e.g., translate into another language)
3. Remix - combine your original or revised copy of the resource with other existing material to create something new (e.g., make a mashup)
4. Reuse - use your original, revised, or remixed copy of the resource publicly (e.g., on a website, in a presentation, in a class)
5. Redistribute - share copies of your original, revised, or remixed copy of the resource with others (e.g., post a copy online or give one to a friend)