I got 2 6509 with one FWSM in each one. My default licence allow me only 2 context-fw. I would like to buy the licence "FR-SVC-FWM-VC-T2" which is for 50 context-fw. I'm using the firewalls in Active/Standby. Do I need to buy 2 of this licences or I can use some sort of FO licence for the standby unit? Anyone know something about it?