Rusmin,

> Since Interbase/Firebird have no security
> on opening the database.
> I mean everybody can open it with a SYSDBA password.

this is almost the same as stating that Linux has no security since
anyone can login with a root password.

While in general I agree that some sort of database-wide (as opposed to
server-wide) user definition is desirable in many cases (f. ex. for web
applications deployed by differente parties and hosted in a way that
they that must share the Firebird server), I don't think it adds much in
terms of security. Trying to protect a database from SYSDBA looks
pointless to me.
My 2c.
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