%% You should probably cite rfc3114 instead of this I-D.
@techreport{ietf-smime-seclabel-04,
    number =    {draft-ietf-smime-seclabel-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-smime-seclabel/04/},
    author =    {Weston Nicolls},
    title =     {{Implementing Company Classification Policy with the S/MIME Security Label}},
    pagetotal = 14,
    year =      2001,
    month =     may,
    day =       8,
    abstract =  {This document discusses how company security policy for data classification can be mapped to the S/MIME security label. Actual policies from three companies provide worked examples. This memo provides information for the Internet community.},
}