The Internet Engineering Steering Group (IESG), the organization responsible for the final review of the Internet standards, has approved the new error 451 for the http protocol, the one used for websites. The purpose of the error 451 is to indicate contents not accessible for legal reasons. In essence, it’s a warning that a content has been censored. The code is inspired to the dystopian masterpiece “Fahrenheit 451” by Ray Bradbury although in that case censorship concerned books.