China vowed Tuesday to keep a tight grip on the Internet, saying it would continue to block anything considered subversive or threatening to "national unity”...The 31-page white paper did not give specific examples of what content would be banned, saying Chinese laws prohibit the spread of "contents subverting state power, undermining national unity, infringing upon national honor and interests, inciting ethnic hatred and secession" as well as such things as pornography and terror. The white paper also put the onus on companies to block content deemed sensitive...