> -----Original Message-----
> I did not understand the license well so I would like to ask some real
> expert:
>
> May I use Firebird + ODBC driver freely in commercial
> non-open-source project?

Yes.

> Or should I pay something to somebody?

You don't have to, but you could donate money to the Firebird Foundation
(http://www.firebirdsql.org/index.php?op=ffoundation), which help's fund the
development of Firebird.

Rgds

Si Carter
http://www.tectsoft.net/
http://www.fbtalk.net/