"Open Educational Resources (OER) are teaching, learning, and research materials that are either (a) in the public domain or (b) licensed in a manner that provides everyone with free and perpetual permission to engage in the 5R activities:
Retain – make, own, and control a copy of the resource
Reuse – use your original, revised, or remixed copy of the resource publicly
Revise – edit, adapt, and modify your copy of the resource
Remix – combine your original or revised copy of the resource with other existing material to create something new
Redistribute – share copies of your original, revised, or remixed copy of the resource with others."
"Creative Commons licenses are the legal means by which authors and creators can grant others permission to reuse their work in certain, specific ways while retaining their copyright.
All Creative Commons licenses have many important features in common.
Every license helps creators...retain copyright while allowing others to copy, distribute, and make some uses of their work — at least non-commercially.
Every Creative Commons license also ensures licensors get the credit for their work they deserve.
Every Creative Commons license works around the world and lasts as long as applicable copyright lasts (because they are built on copyright).
These common features serve as the baseline, on top of which licensors can choose to grant additional permissions when deciding how they want their work to be used."
For more information about Creative Commons licenses and what they allow you to do, see the Open licenses page of this guide.