From Torrent Freak:
Domain name blocking has become one of the entertainment industries’ go-to methods for reducing online copyright infringement.
Blocking requests from both the music and movie sector are widespread around Europe, with The Pirate Bay has being one of the main targets.
This issue prompted Tim Bray to suggest a special HTTP status code for legal blockades. He noticed that some ISPs were using the “403 Forbidden” code for a Pirate Bay block, which is not what it was intended for.
There is no obligation for ISPs or other parties to use the new status. The 451 Unavailable project suggests that ideally it should be used to provide the public with additional details including a copy of the court order.
“A really good Error 451 message would tell their customers how to challenge a block, how long the block’s expected to last, where the relevant legal documents are and which legal authority imposed the blocking order,” they write.
The 451 Unavailable group says it will encourage ISPs to show 451 errors for legal blockades and it eventually hopes to reduce the scope of widespread blocking.
Interestingly, the most recent 451 draft already gives people some suggestions how…