When you visit the CW Live Stream Online site outside of the USA, an error message appears telling you that, the content is not available in your region.

Every Internet Service Providers ISP assigns its users with a server having a unique IP address and the CW network tracks IP Addresses of the people trying to access it. Thus, CW is notified of their current location and is able to block streaming, ensuring that CW live stream is only accessed with IP addresses registered to the US.