The most famous example of this form of censorship is Skype. Whenever skype.com is accessed from Mainland China, it redirects to skype.tom.com. Tom.com is Skype's local partner in Mainland China. The product offered by Tom is visually very similar to the original Skype and the user is not informed of the redirection. However, Tom Skype is subject to Chinese regulations meaning that all personal data, calls and chats are filtered, centrally stored and open to government surveillance. Our system concludes that a website...