%% You should probably cite rfc7725 instead of this I-D.
@techreport{ietf-httpbis-legally-restricted-status-04,
    number =    {draft-ietf-httpbis-legally-restricted-status-04},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-ietf-httpbis-legally-restricted-status/04/},
    author =    {Tim Bray},
    title =     {{An HTTP Status Code to Report Legal Obstacles}},
    pagetotal = 5,
    year =      2015,
    month =     nov,
    day =       10,
    abstract =  {This document specifies a Hypertext Transfer Protocol (HTTP) status code for use when resource access is denied as a consequence of legal demands.},
}