Seth Finkelstein and Philipp Lenssen has written about Censorware:
Censorware (often misleadingly called “filtering”) is software designed and optimized for use by an authority to prevent another person from sending or receiving information. In the United States, it was first discussed in connection with parents who wanted to prevent children from seeing sex-related information. But the issues are by no means restricted to that situation. The very same software which is used by parents in their home, is legally imposed on libraries (which accept certain government funds), and employ by dictatorial governments, e.g. “The Great Firewall Of China”.