It&#x27;s also possible that a site may misleadingly return 451 codes to indicate that they&#x27;ve been censored when perhaps they haven&#x27;t, maybe in order to inflame a discussion or some other political maneuvering.  So, not only can you not trust that a missing 451 means no censorship, you also can&#x27;t trust that a present 451 means there is censorship.