Represents the "CF" entry of the encryption dictionary
object.
It is an optional entry defined as part of the PDF 1.5
specification.
It contains an Element.
For definitive details see:.
The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 20,
page 56.
Adobe Supplement to the ISO 32000, BaseVersion: 1.7,
ExtensionLevel: 3; Table: 3.18, page 14.
The ISO PDF
Specification, ISO 32000-2:2017 PDF 2.0; Table: 20, page 72.
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