Blue Coat has data pods located in multiple countries that resolve from sp.cwfservice.net.
You can configure Dynamic Real-Time Rating to connect only to US data pods by entering the following commands:

SG1# conf t
SG1# (config) content-filter
SG1# (config content-filter)bluecoat
SG1# (config bluecoat)service disable
SG1# (config bluecoat)service service-name sp-us.cwfservice.net
SG1# (config bluecoat)service enable