China hasn't been a welcoming place for many foreign technology companies. Google, Facebook and Twitter are blocked. Microsoft is facing an antimonopoly investigation. Qualcomm, the leading maker of mobile chips, paid the government $975 million to settle an antitrust suit last year and continues to have trouble collecting licensing fees from clients in the country. And things are getting worse. On January 1, a law took effect that requires telecommunications and Internet companies operating in China to provide law enforcement with technical assistance, including decryption of sensitive ...