Query EV/DA/CA Databases for Custom Information

EV/DA/CA 10.0.3 installed.

My customer's security team is looking for a way to write custom SQL queries to the Enterprise Vault databases. Specifically, they want to produce their own custom reports via their own facilities in order to audit the Users, Roles and activities.

Unfortunately, they are rejecting the use of the built-in auditing and reporting features.

Is there any way that they can obtain the EV/DA/CA SQL structure in order to extract from the databases?

Thanks in Advance,

John