Password protected PDF using iTextSharp

        private void ProtectPDF()

        {

            string InputFile = @"~\NewFolder1\Worksheet.pdf";

            string OutputFile = @"~\NewFolder1\Confidential.pdf";

            using (Stream input = new FileStream(InputFile, FileMode.Open

, FileAccess.Read

, FileShare.Read))

            {

                using (FileStream output = new FileStream(OutputFile

 , FileMode.Create

 , FileAccess.Write

, FileShare.None))

                {

                    PdfReader reader = new PdfReader(input);

                    PdfEncryptor.Encrypt(reader, output, true

, "Your Password"

, "owner password"

, PdfWriter.ALLOW_SCREENREADERS);

                }

            }

        }