This is an important issue, but the WSJ is a mainstream paper. This article doesn't go into an in-depth discussion of the technical issues, and it also assumes very little familiarity with the nature of Chinese Net Censorship (which is rather more complicated than the "Thought Police"/1984 picture painted here).
Edit: Actually, I don't think that's the article I had in mind (it came up on RSS a few weeks ago). But it was from that blog, which has several good discussions about this topic.
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[ 2.8 ms ] story [ 12.4 ms ] threadHere's one good link which discusses the Green Dam programme in more detail: http://sun-zoo.com/chinageeks/2009/06/15/ai-weiwei-all-thats...
Edit: Actually, I don't think that's the article I had in mind (it came up on RSS a few weeks ago). But it was from that blog, which has several good discussions about this topic.