YouTube & Censorship

The WSJ has a good article on Youtube and censorship. The article discusses the various countries that have acted to have Youtube blocked for political reasons, or petitioned to have content removed and Youtube's response of blocking specific content for users in specific countries. While I don't expect such an article to go into depth with regard to the mechanism it would have been interesting to note that the same mechanism is used to block based on geographic location for what appear to be reasons of copyright: NBA videos in China and BBC videos in the UK.