Deny access to all users (including Administrator and DomainAdmins) except SA?

How can I ensure that databases in a SQL Server instance are accessible (and
manageable) ONLY through SA account or other accounts created by SA. The
Administrator or DomainAdmins of the box must be denied access to the DB.

Real life scenario: We ship SQL Server DB along with our product. The DB
contains confidential/IP information and hence must not be accessible to
anyone except from the application layer (which maintains the required
credentials). MS Access DBs have a database password that could restrict
access to the DB. How do we achieve it in SQL?

Thank You,
PRadeep


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