Gets or sets the list of Quadrilateral structures defining the annotation area. The coordinates of the quadrilaterals' points are in PDF user space coordinates. The positive X axis extends horizontally to the right, and the positive Y axis extends vertically upward, with the origin usually in the lower left corner of the page.

If not empty, these quadrilaterals denote the content region that is intended to be redacted. If this list is empty, the Rect entry denotes the content region that is intended to be redacted.