A timestamp counted as trusted time whenever its signer's certificate
chained to a trusted certificate, whatever the certificate was issued
for. Any key from a trusted CA could then vouch for an arbitrary time.
Trusted time, for a document timestamp and for a signature's embedded
one, now also needs a certificate whose extended key usage includes
timeStamping, whose key usage allows signing, and which has no critical
extension PdfCraft doesn't process (RFC 3161 §2.3). The test timestamp
authority gets such a certificate.
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