http://www.rfc-editor.org/rfc/rfc4059.txt
RFC 4059: Internet X.509 Public Key Infrastructure Warranty Certificate Extension, D. Linsenbardt, S. Pontius, A. Sturgeon2005-05-01T23:00:00-00:00This document describes a certificate extension to explicitly state the warranty offered by a Certificate Authority (CA) for the certificate containing the extension. This memo provides information for the Internet community.