The internet is full of stuff of which China's government disapproves. Yet there are 300m Chinese internet-users. Keeping the two apart has embroiled the Chinese authorities in a long cat-and-mouse struggle. Service-providers and internet cafés are closely supervised, and a wide array of filtering mechanisms already overlays the national internet architecture. A fresh initiative goes one step further. From July 1st every personal computer sold in China will have to come with new filtering software called Green Dam Youth Escort.

It has yet to be decided whether Green Dam must be pre-loaded, or left on a disk for users to install. But it has sparked an uproar. Chinese internet users have vented online their spleen at being nannied. Hackers are reported to have mounted repeated attacks on the website of Green Dam's developer. It has also received more than 1,000 harassing phone-calls, including death threats.

An American firm, Solid Oak Software, claims Green Dam includes stolen copyrighted code from one of its products, and has launched legal action. Computer makers are understandably reluctant to abet a massive censorship scheme, or to anger their customers with unwelcome software. Moreover, independent experts at the University of Michigan found Green Dam to be riddled with outdated code and security flaws that would leave computers at risk.

America's Commerce Department this week lodged a formal complaint with the Chinese government, asking it to rescind the new rule. The government stresses Green Dam's role in protecting young people from "unhealthy" and "poisonous" pornographic and violent content. But the Michigan experts found that it is also scans text for "politically sensitive" phrases.

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