China has a long history of censoring content - from banning or limiting imports, setting standards for traditional media (and punishing perceived transgressions), to restricting access to a number of foreign Internet sites (including YouTube), and monitoring online content. Still, China also relies heavily on self-censorship from outlets to make sure that only "appropriate" content is made available.
In this case, someone in the PR office for a major online video provider in China, commented on her company's policy
"Nothing with vulgar or violent materials will pass," said the woman, who did not give her name because she said she was not authorized to speak on the record. "Political speech? If it is anti-party and anti-society, it definitely will not pass. No website will allow such content."Source - China wants to censor online video content, Broadcast Newsroom