You will need your account to have the ability to create the database (and possibly a login for adTempus) during installation. So you will need to get the additional permissions for yourself, or have a DBA supply explicit credentials if your SQL Server instance is set up to allow connections using SQL Server security (user ID/password).

The account that you give adTempus to use does not need these permissions--it only needs read, write, and backup.

Be sure you have reviewed the requirements and limitations if you're going to run the adTempus service under a user account.

Also remember that adTempus needs a constant, reliable database connection. Often it's simpler and more reliable to use SQL Server Express installed on the same computer with adTempus.