          /// <summary>Creates a PdfSigner instance.</summary>         /// <remarks>         /// Creates a PdfSigner instance. Uses a         /// <see cref="System.IO.MemoryStream"/>         /// instead of a temporary file.         /// </remarks>         /// <param name="reader">PdfReader that reads the PDF file</param>         /// <param name="outputStream">OutputStream to write the signed PDF file</param>         /// <param name="append">boolean to indicate whether the signing should happen in append mode or not</param>         [System.ObsoleteAttribute(@"will be removed in next major release. Use PdfSigner(iText.Kernel.Pdf.PdfReader, System.IO.Stream, iText.Kernel.Pdf.StampingProperties) instead."             )]         public PdfSigner(PdfReader reader, Stream outputStream, bool append)             : this(reader, outputStream, 