ETSI.CAdES.detached: a PAdES signature (ISO 32000-2 §12.8.3.4; ETSI EN 319 142-1), here the baseline B-B level: a
detached CMS signature whose signed attributes hold the content type, the message digest and the signing certificate, and
no signing time. PDF 2.0.
EtsiCadesDetached = 1