A software developer in southern China surnamed Xie was at home on a recent day, when he responded to a knock on the door.
He opened it to find three plainclothes policemen. Xie asks that we just use his last name, because he fears being arrested.
At the time, he was selling VPN apps on Apple's China app store. VPNs — virtual private networks — help people access Internet content that's blocked in China.