Harry,
If you encounter further resistance/reluctance on the part of the University, direct their attention to a book which they are likely to hold a copy of, entitled Copyright for Archivists and Records Managers by Tim Padfield (2015) 5th ed Facet Publishing ISBN 978-11-85604-929-0. The relevant part is paragraphs 3.3.1 to 3.3.5. Those paragraphs explain the issue from the perspective of an institution such as a library, archive or museum etc.
