There is a growing body of literature in this area. Here are some volumes that might help you get started: Feldman, Weil and Biederman. Art Law. I & II Little, Brown, 1986 Malaro. A Legal Primer on Managing Museum Collections. Smithsonian, 1985 Merryman and Elsen. Law, Ethics and the Visual Arts. I & II Penn, 1987 Phelan. Museums and the Law. AASLH, 1982