Is the issue of a proprietary DBMS relevant to EMu?

No. EMu is a commercial off the shelf ("COTS") application based on Texpress. It provides all the functionality required for collections management, including Internet and Intranet access. Export and reporting capabilities are available via ODBC and XML interfaces. In the majority of cases, this is all that is required for a collections management system. Texpress can be considered to be an "embedded" database underlying EMu. Thus the identity of the database is largely irrelevant. A source code escrow service is available at an additional cost.