How to change printing option PdfWriter.AllowPrinting

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C#

I had created below code to protect pdf.
But I forgot to allow printing option.
Now printing option is disabled in all my protected pdfs.
Is there any solution to change the printing option to allow for all protected pdfs.

using iTextSharp.text.pdf;

using (Stream input = new FileStream(InputFile, FileMode.Open, FileAccess.Read, FileShare.Read))
{
      using (Stream output = new FileStream(OutputFile, FileMode.Create, FileAccess.Write, FileShare.None))
      {
            PdfReader reader = new PdfReader(input);
            PdfEncryptor.Encrypt(reader, output, true, userpwd, masterpwd,PdfWriter.AllowScreenReaders);
       }
}