iTextSharp.text.pdf.PdfEncryption.SetupByOwnerPad C# (CSharp) Метод

        private void SetupByOwnerPad(byte[] documentID, byte[] ownerPad, byte[] userKey, byte[] ownerKey, int permissions)
        {
            byte[] userPad = ComputeOwnerKey(ownerKey, ownerPad); //userPad will be set in this.ownerKey
            SetupGlobalEncryptionKey(documentID, userPad, ownerKey, permissions); //step 3
            SetupUserKey();
        }