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Error Code 451: an HTTP error for censorship - http://tldr.io/tldrs/51fd3330d93ec963210028ad/error-code-451-...
XML creator Tim Bray has proposed a new HTTP error code: 451, "Legally restricted." The idea is to create an unambiguous code that ISPs can return when a user requests a page that has been censored by a court or government. Read complete article ‎- silpol