Represents the "P" entry of the standard security handler encryption dictionary object.

It is a required entry defined as part of the PDF 1.0 specification.

It contains an integer representing a PDF numeric object.

For definitive details see:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 21, page 60.

Adobe Supplement to the ISO 32000, BaseVersion: 1.7, ExtensionLevel: 3; Table: 3.19, page 16.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 21, page 77.

The P entry encodes the document permission flags as a signed 32-bit integer. Each bit controls a specific operation such as printing, copying text, or modifying the document. The bit definitions are fixed by the specification.

The permission flags are incorporated into the encryption key derivation in revisions up to 5, making them tamper-evident. In revision 6 they are additionally stored in the encrypted Perms entry for explicit verification after decryption.