Represents the "Matrix" entry of the fixed print dictionary object.

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

It contains a MatrixElement.

For definitive details see:.

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.

The matrix is a six-element affine transformation array. It is applied to the watermark content to position it relative to the page corner defined by the H and V fractions.