China is set to require computer makers such as Dell Inc. (DELL), Hewlett-Packard Co. (HPQ) and Lenovo Group Ltd. (LNVGY) to include the Web-filtering software, officially called Green Dam Youth Escort, in any PCs sold in China. The Chinese government claims that the software, known as Green Dam, is necessary to prevent children from gaining access to online pornography and other content deemed to be harmful.China is pressuring PC makers to install a controversial piece of Web-filtering software called Green Dam with all new computers sold in the country beginning July 1. The government says the move is to protect children from pornography and other inappropriate content, but many suspect it also wants to use the software to restrict political information.PC makers such as Hewlett-Packard, Dell and Apple do not disclose how much of their sales come from China. The companies have also not commented on what impact they might face by not complying with the Chinese government’s request.