Database protection

Is there a way to prevent users from logging into an MSDE database instance?
I created an MSDE instance using a strong SA password but I was still able
to logging to the database using Windows Authentication.

The reason I don't want the user to see the database is because the database
structure that I am distributing (MSDE) is exactly the same as the one I
have online. If I let the user peek into my MSDE database they might find a
way to mess-up the database that is online. I just don't want to take the
risk.

Also, is stored procedure encryption easily bypassed if I logon as a
database administrator?

Thanks.


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