Code of Best Practices in Fair Use for Open Educational Resources: A Guide for Authors, Adapters & Adopters of Openly Licensed Teaching and Learning Materials
by
Facilitators Meredith Jacob, Peter Jaszi, Prudence S. Adler & William Cross
OER Textbooks 
Creative Commons defines Open Educational Resources (OER) as 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– retaining, remixing, revising, reusing and redistributing the resources.
LOW-COST Textbooks