MemoryStream fs = GetSaarForm();
            PdfReader.unethicalreading = true;
            PdfReader reader = new PdfReader(fs.ToArray(), null);
            string pwd = "";
            if (string.IsNullOrEmpty(pwd))
                pwd = System.Web.Security.Membership.GeneratePassword(20, 5);
            using (MemoryStream ms = new MemoryStream())
            {
                using (PdfStamper stamper = new PdfStamper(reader, ms, '', false))
                {
                    stamper.SetEncryption(
                        null,
                        System.Text.Encoding.UTF8.GetBytes(pwd),
                        PdfWriter.ALLOW_PRINTING | PdfWriter.ALLOW_COPY,
                        PdfWriter.ENCRYPTION_AES_128);
                    AcroFields form = stamper.AcroFields;
                    StampSaarPdf(form, candidate, saar);

                }
                //SaveSaarPassword(candidateId, pwd);
                return ms.ToArray();
            }