In Lotus article on autosport I found another interesting piece of info
So, in he past it happened that team participated in F1 without signing Concorde. Is it possible now?That situation could change, however, when Lotus signs the Concorde Agreement - when it will then have to comply with a clause that demands no parts of its 2010 car have been designed by anyone working for another team
E.g. it seems that if Toro Rosso doesn't sign Concorde it may use RedBull designed chassis again.