China recently launched a crackdown on the use of software which allows users to get around its heavy internet censorship. Now as the BBC reports, developers are facing growing pressure. From the report: The three plain-clothes policemen tracked him down using a web address. They came to his house and demanded to see his computer. They told him to take down the app he was selling on Apple's App Store, and filmed it as it was happening. His crime was to develop and sell a piece of software that allows people to get round the tough restrictions that limit access to the internet in China. A virtual private network (VPN) uses servers abroad to provide a secure link to the internet. It's essential in China if you want to access parts of the outside world like Facebook, Gmail or YouTube, all of which are blocked on the mainland. "They insisted they needed to see my computer," the software developer, who didn't want us to use his name, told us during a phone interview. "I said this is my private stuff. How can you search as you please?" No warrant was produced and when he asked them what law he had violated they didn't say. Initially he refused to co-operate but, fearing detention, he relented. Then they told him what they wanted: "If you take the app off the shelf from Apple's App Store then this will be all over." 'Sorry, I can't help you with that'. Up until a few months ago his was a legal business. Then the government changed the regulations. VPN sellers need a licence now.