Guys,

>> Do you want to say that UDF may be secure in one database, but insecure in
>> another?
> Do you have any doubt? :-)
>
> Actually it's a problem even for different users of the same database.
> [...]
> Do you think a digital signature function should be so unprotected?
>
> This is one of things I'm using in Oracle, and I'm satisfied with they
> security.

I suggest to stop here - if you want to discuss Firebird'd security in
general (and what you show is a column-level permissions on the metadata
objects), create a separate thread and invite Red Soft into it, they
have a lot of input for the topic.

Roman