Oregon’s House Bill 2871 requires faculty to indicate clearly when a course section uses exclusively open textbooks or other low-cost and no-cost course materials. If you use open educational resources (OER) in your class, you are required to share that information with students. There is an established compliance process in place at Oregon State that relies on the OSU Beaver Store's textbook information upload system.
http://open.oregonstate.edu/textbooks/upload-process.htm