Best as I can tell from your question you are asking for something that is impossible.
SQL Server normally installs as an application. Thus it is ALWAYS visible on the client machine.
Now you could re-architect your application to use the embedded version of SQL Server (I think.) Then it would appear that only your application existed. I suspect this would require a bit of work. There are limitations to that approach.
Note as well that this has nothing to do with security. Security means something completely different.
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