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Since Sony has started shipping Chinese PCs with the Green Dam filtering software early, I'm making this post a bit early instead of putting it up on July 1st.
If you live in China and are buying a new computer, or have friends or family who are, remember this: You are not legally required to keep Green Dam on your computer. Computer shops are required by law to install it, but you are free to uninstall it.
More information on the Green Dam filtering software and its problems, see this analysis by Wolchok, Yao, and Halderman.