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Originally posted by Helig
Theoretically speaking all it would take to 'block' a site is to filter any DNS requests going outside of of the US, then modify the routing tables on the root DNS servers within the US to not resolve say youtube.com or cnn.com. The only hitch in this would be anybody who runs a DNS server in their home would still be able to access sites that nobody else in the US could because their DNS server didn't take marching orders from the modified ones. This same technique could quite easily be used in other countries however its probably easiest to pull off in the US based on the network topology and how we connect to the rest of the world.