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Represents the "DigSig" entry of the requirement dictionary
object.
It is defined as part of the PDF 2.0 specification.
It contains a SignatureElement.
For definitive details see:.
The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 264,
page 484.
The ISO PDF
Specification, ISO 32000-2:2017 PDF 2.0; Table: 274, page 603.
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