i grepped through some other signed PDFs created from within Adobe Acrobat, signed with differing CA certs and timestamp servers and DigestAlgos - they all report the same md5 DigestValue...(?)
disappointingly, tests with LibreOffice Writer signed/timestamped PDFs did not display a DigestValue. LO 5 can sign/timestamp exported PDFs but only timestamp from a non-AUTH http[s] timestamp server see https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=810723 shall await mr exiftool's prognosis of DigestValue...
