Employees forced to tell when they are going to use VPN

China is known for it's great firewall.

Cyber Security Tools list 2012

This list is an collection of cyberwarfare and cybercrime tools.

Placing Backdoors through Firewalls

 This article describes possible backdoors through different firewall architectures.

China security: Great Firewall Of China

Internet censorship in the People's Republic of China is conducted under a wide variety of laws