Gets or sets the list of Quadrilateral structures defining the annotation area. The coordinates of the quadrilaterals' points are relative to the upper left corner of the page's media box, with the Y (vertical) coordinates increasing from top to bottom.

Note that if the annotation is associated with more than one page, the media box of the first of those pages is used to calculate the coordinates.

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.