This example response is taken from the IETF RFC (see below) and contains a reference to Monty Python's Life of Brian.
Link header might also contain a
rel="blocked-by" relation identifying the entity and implementing blockage, not any other entity mandating it.
Any attempt to identify the entity ultimately responsible for the resource being unavailable belongs in the response body, not in the
rel="blocked-by" link. This includes the name of the person or organization that made a legal demand resulting in the content's removal.
HTTP/1.1 451 Unavailable For Legal Reasons
<head><title>Unavailable For Legal Reasons</title></head>
<h1>Unavailable For Legal Reasons</h1>
<p>This request may not be serviced in the Roman Province
of Judea due to the Lex Julia Majestatis, which disallows
access to resources hosted on servers deemed to be
operated by the People's Front of Judea.</p>