(a) An oral interview that is obtained for historical purposes by an agreement of confidentiality between an interviewee and a state institution of higher education is not public information. The interview becomes public information when the conditions of the agreement of confidentiality have been met.
(b) Rare books, original manuscripts, personal papers, unpublished letters, and audio and video tapes held by an institution of higher education for the purposes of historical research are confidential, and the institution may restrict access by the public to those materials to protect the actual or potential value of the materials and the privacy of the donors.