_extended="true">_extended="true">BEIJING, China (CNN) -- Individual computer users in China may choose whether to install a controversial content filtering system, but the system will be installed on computers in any public place, China's minister of Industry and Information Technology said Thursday._extended="true"> _extended="true">_extended="true" />_extended="true"> _extended="true"> _extended="true">People sit at a wireless cafe in Beijing, using their laptop computers._extended="true">_ex