Why did the Chinese Media Censor President Barack Obama's inauguration Speech about "Communism"?

In China there is very strict censorship - the government will not tolerate any threats to its power, so to prevent backlash from civilian groups it has censored anything on TV/Internet which contradicts its laws - including any criticisms about communism itself. In fact many chinese internet users cannot access the likes of western political speeches on the Internet - their access is denied by the chinese government because the content of such speeches may threaten chinese political beliefs. To many western nations this is a clear infringement of human rights - the right to be freely informed and to choose what you watch/do in your private life.  more