For example, Registrar's data includes everyone that's been accepted. Following the last day to pay fees, that population drops dramatically. For students, the Libraries need Name, Campus ID, Current address, Home address, Phone, E-mail, Year in School and Department among other information. A similar set of information is needed for faculty and staff. This information is used to determine patron privileges.
Libraries serve a variety of customers.
In addition to faculty, staff, and students. Some of these programs provide rosters to the library. In some cases people may register for a short course in the morning and show up in the afternoon to use the Library. In these cases the Library keys in the necessary information. The Libraries are not data custodians for data used in circulation other than for those special borrowers.