A software company in California has sued two Chinese technology firms, charging that they stole its computer code to make an Internet-monitoring program that China's government sought to install on every computer in the country last year before backing down. The lawsuit by Cybersitter also names as defendants seven computer makers, including Sony, Lenovo and Acer, accusing them of willingly joining a Chinese government plan to spread the software, known as Green Dam Youth Escort, throughout the country.