This document defines the format of an electronic signature that can
remain valid over long periods. This includes evidence as to its
validity even if the signer or verifying party later attempts to deny
(i.e., repudiates) the validity of the signature. The format can be
considered as an extension to RFC 3852 and RFC 2634, where, when
appropriate, additional signed and unsigned attributes have been
defined. The contents of this Informational RFC amount to a
transposition of the ETSI Technical Specification (TS) 101 733 V.1.7.4
(CMS Advanced Electronic Signatures -- CAdES) and is technically
equivalent to it. The technical contents of this specification are
maintained by ETSI. The ETSI TS and further updates are available free
of charge at:
http://www.etsi.org/WebSite/Standards/StandardsDownload.aspx This memo
provides information for the Internet community.