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Represents the "AuthEvent" entry of the crypt filter dictionary
object.
It is an optional entry defined as part of the PDF 1.0
specification.
It contains a string representing a PDF name object.
The PDF specification states that this item assumes a value of
"DocOpen" if no value has been provided.
This item may take one of the following valid values:.
For definitive details see:.
The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 25,
page 68.
Adobe Supplement to the ISO 32000, BaseVersion: 1.7,
ExtensionLevel: 3; Table: 3.22, page 22.
The ISO PDF
Specification, ISO 32000-2:2017 PDF 2.0; Table: 25, page 90.
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