> If Firebird is on a database server then the user's time settings

are not relevant

usually the database will be on a server, so as you wisely point out
and as I stupidly overlooked, there will be no problem at all.

For some minor installations, both database and application could be
on the same machine.

In those cases, nothing can be done to enforce security, as those
installations won't be connected to Internet.

Thank you

Duilio Foschi