This class represents the fixed print dictionary. This is definitively detailed in:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 191, page 411.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 194, page 498.

System.Object
    WebSupergoo.ABCpdf14.Elements.Element
       WebSupergoo.ABCpdf14.Elements.FixedPrintElement

A fixed print dictionary controls the size and position of a watermark annotation on printed output, independently of the current page size. The Matrix entry positions the watermark content. The H and V entries anchor it at a fixed fraction of page dimensions.