Represents the "Action" entry of the signature field lock dictionary object.

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

It contains a string representing a PDF name object.

This item may take one of the following valid values:.

• All
• Include
• ExcludeAll

For definitive details see:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 233, page 447.

Adobe Supplement to the ISO 32000, BaseVersion: 1.7, ExtensionLevel: 3; Table: 8.82, page 43.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 236, page 541.

All locks every field in the document. Include locks only the fields named in the Fields array. Exclude locks all fields except those named. The action is evaluated at the moment the signature is applied.