Open Educational Resources (OER) are "teaching, learning, and research resources that reside in the public domain or have been released under an intellectual property license that permits their free use and re-purposing by others."
OER allow users to:
FYI from SPARC (the Scholarly Publishing and Academic Resources Coalition):
The Affordable College Textbook Act<https://sparcopen.org/our-work/2017-act-bill/> was reintroduced in the U.S. House and Senate. This bill creates a grant program at the U.S. Department of Education for colleges and universities to develop pilot programs that use open educational resources (OER) to reduce the cost of textbooks for students. The legislation was introduced in the House by Representatives Polis (D-CO) and Sinema (D-AZ) and in the Senate by Senators Durbin (D-IL), Franken (D-MN), and King (I-ME).
The final bill text is here<https://sparcopen.org/wp-content/uploads/2015/12/AEG17508.pdf>.
Open Textbooks have been released with an open license (usually a Creative Commons license) which allows them to be copied, shared and revised.
OER Repositories contain more than just open textbooks. They also have other digital learning materials such as: