>In my situation, users update the database via an application software provided by us. So, the DBA at the customer site still has to rely on the application to maintain the database. We as the software provider are responsible for the source code.
>
>Given that "with encryption" provides no protection at all. The question still remains: How can I protect my source code?

James,

If you want to protect your source code keep it out of Database.
Check Re: Encription Message #1010657. I didn't use any of those tools so cannot say if they even encrypt stored procedures.