Represents the "User" entry of the optional content usage dictionary object.

It is an optional entry defined as part of the PDF 1.0 specification.

It contains an OptionalContentUsageUserElement.

For definitive details see:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 102, page 233.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 100, page 285.

The User sub-dictionary restricts this group to a specific user type or named user. It contains a Type entry (Ind for individual or Grp for group) and a Name entry with one or more user identifiers.