Don't Risk It
Once the policy is in place, your informational campaign should begin with a memorandum to the faculty. With a policy in place, you are in a better position to convince your customers of the necessity for compliance with the policy and the law.
When Must I Seek Permission?
If you combine as few as two items (i.e. one journal article and one book chapter), you should ask for permission. If an instructor brings the same single article every semester, you must ask for permission. If a professor requests multiple copies of what appears to be more than 10 percent of a book, check your on-line library catalog for the total number of pages in the book. If the requested pages exceed 10 percent, inform the professor and offer to request permission on his or her behalf.