> The only "plain" way I can see for this is to implement
> the feature directly in your RDBMS of choice.
> It may not be easy, but I haven't examined the sources.

as database and program already exist and work, this looks the best
solution.

I wonder how feasible it is.

If the same low level Read/Write functions are used along the whole
program (both for table data and keys), the effort should be minimal.

(A few years ago I modified 2 lines of Doctor Boss - an ISAM database
and got the database crypted)

I wonder if somebody - who already browsed the FB source code - could
help here.

>we can speak Italian( since I'm Italian as well ).

piacere!

Duilio