iTextSharp.text.pdf.PdfDictionary.Remove C# (CSharp) Method

        public void Remove(PdfName key)
        {
            hashMap.Remove(key);
        }

        private void UpdateDss()
        {
            PdfDictionary catalog = reader.Catalog;

            writer.MarkUsed(catalog);
            PdfDictionary dss   = catalog.GetAsDict(PdfName.DSS);
            PdfArray      ocsps = dss.GetAsArray(PdfName.OCSPS);
            PdfArray      crls  = dss.GetAsArray(PdfName.CRLS);
            PdfArray      certs = dss.GetAsArray(PdfName.CERTS);

            dss.Remove(PdfName.OCSPS);
            dss.Remove(PdfName.CRLS);
            dss.Remove(PdfName.CERTS);
            PdfDictionary vrim = dss.GetAsDict(PdfName.VRI);

            //delete old validations
            if (vrim != null)
            {
                foreach (PdfName n in vrim.Keys)
                {
                    if (validated.ContainsKey(n))
                    {
                        PdfDictionary vri = vrim.GetAsDict(n);
                        if (vri != null)
                        {
                            DeleteOldReferences(ocsps, vri.GetAsArray(PdfName.OCSP));
                            DeleteOldReferences(crls, vri.GetAsArray(PdfName.CRL));
                            DeleteOldReferences(certs, vri.GetAsArray(PdfName.CERT));
                        }
                    }
                }
            }
            if (ocsps == null)
            {
                ocsps = new PdfArray();
            }
            if (crls == null)
            {
                crls = new PdfArray();
            }
            if (certs == null)
            {
                certs = new PdfArray();
            }
            OutputDss(dss, vrim, ocsps, crls, certs);
        }