Not every country has the same type of government and not every country is like North Korea having set some heavy rules. The underlined metaphor is that the country reduces every possible way of being free – be it freedom of operating a computer system or searching data. Is it known to all that North Korea has its own Linux distribution Red Star OS and it limits everyone to a government approved view of the world.
While going deep into how Red Star works, researchers found that it is highly authoritarian. Besides its known tendency to watermark files on USB sticks, Red Star is paranoid about modifications. It not only has extra safeguards around key system files, but will immediately reboot the PC if it detects any changes to those files. The included antivirus software and web browser point to internal servers and even the encryption is custom-developed. On the other hand, North Korea is determined to keep as much technology in-house as it can.
The isolation from others shows that the country wants her people to be unaware of what is happening around the globe. The software Red Star has some security benefits though. But you better not modify the system to get around censorship as the officials might track you down.