I depend on the test banks that publishers provide with their textbooks. Do OER include test banks, and if they're open, what's to prevent a student for getting access to them? Some open textbooks do include test banks as well as presentation slides and other resources we're used to getting from a publisher. To answer the question about "protected resources" here is the feedback from Nicole Finkbeiner, Associate Director of Institutional Relations for OpenStax: "In terms of "protected" resources such as test banks, you have to find a way for students to not be able to access these. And, you don't want to openly license these because then you have no way to combat them being published. At Rice University’s OpenStax, our website is set-up so faculty have to first register for an account and then request faculty access prior to being able to download them. We check every single account to ensure the right official email is used, they are in fact teaching a course where they would need the resources, etc. Sometimes we even call the department chair directly to make sure we should be providing access, so this is definitely a labor-intensive process, but I think it is worth it to protect the resources."