(Image source: http://ohda.matrix.msu.edu/2012/06/a-creative-commons-solution/)
Learn more about the different Creative Commons licenses and how they affect using and sharing open resources and materials.
This simple tool helps you choose a Creative Commons license based on your license feature preferences.
Understanding what you can do with a resource that is truly open.
A website outlining the basics of copyright and fair use. Includes various resources to help you determine if and how you may use a copyrighted work in the classroom.
In addition to Creative Commons licensed works, works in the public domain can be legally distributed, and thus may be helpful in building an OER-based course.
Public domain is a complicated legal concept. The Cornell Library has an excellent guide to Copyright Term and the Public Domain in the United States