Represents the "EP" entry of the full file specification dictionary object.

It is defined as part of the PDF 2.0 specification.

It contains an EncryptedPayloadElement.

For definitive details see:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 44, page 102.

Adobe Supplement to the ISO 32000, BaseVersion: 1.7, ExtensionLevel: 3; Table: 3.41, page 26.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 43, page 134.

The EP entry references an encrypted payload dictionary when this file specification is used to attach an encrypted payload to a PDF wrapper document. It is used in the PDF 2.0 encrypted payload mechanism.