New error for censorship

Internet users can now see a new HTTP status code given when you visit a page that has been offline for legal reasons.

The new error message is displayed when a website is blocked by order of the court. This way is made clear when there is censorship by the government and other 'legal obstacles'.
The number 451 is a reference to the science fiction story Fahrenheit 451. That's about a society where government censorship and suppression of ideas are the order of the day.