I have just recently tried adding watermarks in Groupdocs.Viewer like so:
.Watermark(“Firstname Lastname - email@example.com”, System.Drawing.Color.FromArgb(50, 0, 0, 0), WatermarkPosition.Diagonal, 130f, true);
However Groupdocs.Annotations does not have similar method in its WidgetFactory().
Is it possible to add watermarks to documents? This would be meant as a security measure for sensitive documents, not for editing.