All liveupdate servers are using akamaitechnology..for definition and patch updates..
When you run Liveupdate it goes to
liveupdate.symantecliveupdate.com
or liveupdate.symantec.com
then these site search which is the closest Akamai server in your location and then from those akamai server your definitions get downloaded.
Symantec definitions are hosted on Akamai servers.So that for liveupdate around the world everybody doesn't have to go to US Liveupdate servers.