Represents the "CreatorInfo" 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 OptionalContentUsageCreatorElement.

For definitive details see:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 102, page 232.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 100, page 284.

The CreatorInfo sub-dictionary identifies the application that created the usage data and describes what kind of content the optional content group represents. It contains a Creator string and a Subtype name.