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Represents the "Lock" entry of the signature field object.
It is an optional entry defined as part of the PDF 1.5
specification.
It contains a SignatureFieldLockElement.
For definitive details see:.
The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 232,
page 446.
The ISO PDF
Specification, ISO 32000-2:2017 PDF 2.0; Table: 235, page 540.
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