iTextSharp.text.pdf.PdfStamper.SetEncryption C# (CSharp) Метод

        public void SetEncryption(X509Certificate[] certs, int[] permissions, int encryptionType)
        {
            if (stamper.IsAppend())
                throw new DocumentException(MessageLocalization.GetComposedMessage("append.mode.does.not.support.changing.the.encryption.status"));
            if (stamper.ContentWritten)
                throw new DocumentException(MessageLocalization.GetComposedMessage("content.was.already.written.to.the.output"));
            stamper.SetEncryption(certs, permissions, encryptionType);
        }

        /** Entry point to encrypt a PDF document. The encryption parameters are the same as in
         * <code>PdfWriter</code>. The userPassword and the
         *  ownerPassword can be null or have zero length. In this case the ownerPassword
         *  is replaced by a random string. The open permissions for the document can be
         *  AllowPrinting, AllowModifyContents, AllowCopy, AllowModifyAnnotations,
         *  AllowFillIn, AllowScreenReaders, AllowAssembly and AllowDegradedPrinting.
         *  The permissions can be combined by ORing them.
         * @param reader the read PDF
         * @param os the output destination
         * @param userPassword the user password. Can be null or empty
         * @param ownerPassword the owner password. Can be null or empty
         * @param permissions the user permissions
         * @param strength128Bits <code>true</code> for 128 bit key length, <code>false</code> for 40 bit key length
         * @param newInfo an optional <CODE>String</CODE> map to add or change
         * the info dictionary. Entries with <CODE>null</CODE>
         * values delete the key in the original info dictionary
         * @throws DocumentException on error
         * @throws IOException on error
         */
        public static void Encrypt(PdfReader reader, Stream os, byte[] userPassword, byte[] ownerPassword, int permissions, bool strength128Bits, Hashtable newInfo)
        {
            PdfStamper stamper = new PdfStamper(reader, os);

            stamper.SetEncryption(userPassword, ownerPassword, permissions, strength128Bits);
            stamper.MoreInfo = newInfo;
            stamper.Close();
        }