public static PdfAnnotation CreateStamp(PdfWriter writer, Rectangle rect, string contents, string name)
{
PdfAnnotation annot = new PdfAnnotation(writer, rect);
annot.Put(PdfName.SUBTYPE, PdfName.STAMP);
annot.Put(PdfName.CONTENTS, new PdfString(contents, PdfObject.TEXT_UNICODE));
annot.Put(PdfName.NAME, new PdfName(name));
return annot;
}