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In computer networking, "HTTP 451 Unavailable For Legal Reasons" is a proposed and not yet universally adopted error status code of the HTTP protocol to be displayed when the user requests an illegal resource, such as a web page censored by a government, with the number 451 being a reference to the 1953 dystopian novel Fahrenheit 451, where books are outlawed. 451 could be described as a more descriptive variant of 403 forbidden
Examples of situations where an HTTP 451 error code could be displayed include web pages deemed a danger to national security, or web pages deemed to violate copyright, privacy, blasphemy laws, or any other law or court order.