A redaction annotation: content marked for removal, and how the removed region looks afterwards.
public sealed class PdfRedactAnnotation : PdfMarkupAnnotation
ISO 32000-2 §12.5.6.23, Table 195 (PDF 1.7). Reading never applies the redaction.
kind:method, kind:property, kind:ctor. Press Esc to clear.DefaultAppearanceGets the default appearance string of the overlay text (DA, required with OverlayText), or null.InteriorColorGets the interior colour (IC, PDF 1.4), or null for none.JustificationGets the justification of the text (Q, PDF 1.4); default left.OverlayGets the form XObject drawn over the redacted region (RO), or null; it takes precedence over the colour, text and justification entries.OverlayTextGets the text drawn over the redacted region (OverlayText), or null.QuadPointsGets the quadrilaterals of the content to remove (QuadPoints), as stored; empty when absent, in which case the rectangle is the region.RepeatsOverlayTextGets a value indicating whether the overlay text repeats to fill the region (Repeat); default false.