Creative Commons provides information on ways to legally share your online resources. Look here for information on the license to use when licensing your own material or citing someone else's material in your course.
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.