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A Chinese woman walks past the Google logo at the Google China headquarters in Beijing, China Google China headquarters in Beijing. Photograph: Ng Han Guan/AP Google has not renewed its licence to be an "internet content provider" in China, signalling the end of its ambition to provide search and other internet services inside the country's "Great Firewall" which filters out content deemed sensitive by its government.

A growing number of software companies are capitalizing on an unexpected business opportunity: Internet censorship. In countries where governments continue to ramp up Web filtering systems, more people are searching for tools that will allow them to access inaccessible information -- and they are willing to pay for them. Such tools include virtual private networks (VPN), proxy servers and other workarounds that enable users to breach barriers to blocked information online.