> After creating a database under a different name to SYSDBA, is it
> possible to store the SYSDBA'a access rights to the database to nothing
> at all?
>
> This would prevent someone from copying the database to their own
> Firebird installation and getting full access.
>
> Raymond Kennington

No - can't be done. The securuty model is having a lot of work done to it
but at the moment SYSDBA is the system admin and by definition has total
access to anything on the server.
You need to protect the file itself against theft.
Alan
PS - where did those users come from?