The DBA of a production system will have rights to see all atabase objects.

If you use 'encrypted' stored procedures and functions, the DBA will not be able to view the contents of these in SSMS, but as Gail says this is just obfuscation and is trivial to reverse.

If this is an in-house application then you have next to zero justification for trying to hide your database objects from the production DBA. You just make your system less reliable to operate.

If this is a system that is to be sold, then normal practice is that you protect yourself with contractural agreements, not by trying to hide the internals of your system.