This document discusses open educational resources (OER) licensing. It defines OER as teaching and learning materials that can be freely used and adapted. Copyright automatically protects original creative works but allows fair use. Works in the public domain are not copyrighted. Creative Commons licenses allow creators to choose how others can use their works, such as allowing non-commercial reuse with attribution. The most open license is CC BY, which just requires attribution. Less open licenses add restrictions like non-commercial use or no adaptations. Understanding OER licenses helps educators make resources more accessible.