我可以用iTextSharp填写加密的PDF吗？

using System;
using System.IO;
using iTextSharp.text.pdf;
using iTextSharp.text.pdf.security;

namespace FillEncryptedPDFForm
{
    class Program
    {
        static void Main(string[] args)
        {
            string inputFile = "encrypted_form.pdf";
            string outputFile = "filled_form.pdf";
            string userPassword = "user_password";
            string ownerPassword = "owner_password";

            using (FileStream fs = new FileStream(inputFile, FileMode.Open, FileAccess.Read))
            {
                PdfReader reader = new PdfReader(fs, new byte[] { 0x28, 0xbf, 0x4e, 0x5e, 0x4e, 0x75, 0x8a, 0x41, 0x64, 0x00, 0x4e, 0x56, 0xff, 0xfa, 0x01 });
                using (FileStream outputFs = new FileStream(outputFile, FileMode.Create, FileAccess.Write))
                {
                    PdfStamper stamper = new PdfStamper(reader, outputFs, (char)0, true);
                    AcroFields fields = stamper.AcroFields;

                    // Fill in the form fields
                    fields.SetField("field1", "value1");
                    fields.SetField("field2", "value2");
                    fields.SetField("field3", "value3");

                    // Encrypt the document
                    stamper.SetEncryption(null, null, PdfWriter.ALLOW_PRINTING, PdfWriter.ENCRYPTION_AES_128);

                    stamper.Close();
                }
            }
        }
    }
}