Represents the "Encrypt" entry of the cross-reference stream
dictionary object.
It is defined as part of the PDF 1.1 specification.
It contains an EncryptionElement.
For definitive details see:.
The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 17,
page 50.
The ISO PDF
Specification, ISO 32000-2:2017 PDF 2.0; Table: 17, page 65.
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