Cisco Wireless :: 5508 - WLC Redundancy - Disaster Recovery?

My questions is in relation to disaster recovery, for wireless.  We have our main data center, in the US, with two 5508 controllers.  We have a DR location, in Europe, with two 5508 controller.  We're upgrading our 5508's to the 7.4 code, so that we can take advantage of the RP port for our controllers.  With that said, is there a way to make the US and Europe controllers redundant?

If there's a disaster, in the US, would the AP licensing, and AP's attach to the European controllers?  Our AP's are set up with HA.  I'm more concerned about the licensing flipping over to the DR controllers.  I've tried researching this topic, and can't really find anything on it.