ITEXTSHARP - PDF PERMISION EDIT

class PdfEdit
    {
        public PdfEdit()
        {

        }

        public enum permission
        {
            Assembly = PdfWriter.ALLOW_ASSEMBLY,
            Copy = PdfWriter.ALLOW_COPY,
            DegradedPrinting = PdfWriter.ALLOW_DEGRADED_PRINTING,
            FillIn = PdfWriter.ALLOW_FILL_IN,
            ModifyAnnotation = PdfWriter.ALLOW_MODIFY_ANNOTATIONS,
            ModifyContent = PdfWriter.ALLOW_MODIFY_CONTENTS,
            Printing = PdfWriter.ALLOW_PRINTING,
            ScreenReaders = PdfWriter.ALLOW_SCREENREADERS
        };

        public enum encryption
        {
            Standart_128 = PdfWriter.STANDARD_ENCRYPTION_128,
            Standart_40 = PdfWriter.STANDARD_ENCRYPTION_40
        };

        public static void PdfEditPermission(string SourcePdfFile, string TargetPdfFile, string Login, string Password, int[] Permission, int Encryption)
        {
            PdfReader _Reader = new PdfReader(SourcePdfFile); 

            int pageNumber = _Reader.NumberOfPages;

            Document _Document = new Document(_Reader.GetPageSizeWithRotation(1));
            PdfWriter writer = PdfWriter.GetInstance(_Document, new FileStream(TargetPdfFile, FileMode.Create));

            PdfEncryption(writer, Login, Password, Permission, Encryption);

            _Document.Open();

            PdfContentByte _ContentPDF = writer.DirectContent;
            PdfImportedPage _Page;
            int rotation = 0;

            for (int i = 1; i <= pageNumber; i++)
            {
                _Document.SetPageSize(_Reader.GetPageSizeWithRotation(i));

                _Document.NewPage();

                _Page = writer.GetImportedPage(_Reader, i);

                rotation = _Reader.GetPageRotation(i);

                if (rotation == 90 || rotation == 270)
                    _ContentPDF.AddTemplate(_Page, 0, -1f, 1f, 0, 0, _Reader.GetPageSizeWithRotation(i).Height);
                else
                    _ContentPDF.AddTemplate(_Page, 1f, 0, 0, 1f, 0, 0);
            }

            _Document.Close();
        }

        private static void PdfEncryption(PdfWriter writer, string Login, string Password, int[] bufferPermission, int Encryption)
        {
            int permission = 0;

            foreach (int i in bufferPermission)
            {
                permission |= (int)i;
            }

            writer.SetEncryption(Encryption, Login, Password, permission);
        }

    }