Interception of communication - illegality

Just another example that the internet should not escape the rules... "Chinese Skype service censoring messages" (2 October 2008) and on TechDirt
Actually I wonder to which extend Skype's responsibility should not be engaged. But under which laws, may you reply?
(09 october 2008): the new episode of the affair is that Skype was apparently sub-contracting to a company that was spying. This is a typical case of vicarious liability both in contract law and criminal law.

To which extend tracking data by ISPs is also interception of communication I wonder... "Most People Don't Realize Their ISPs Are Already Spying On Them" (2 October 2008)