Dear all, I encountered a problem when I tried to sign a signature field
in a pdf file with itext. Here is the code: IExternalSignature
externalSignature = new X509Certificate2Signature(sign_cert, hashAlg);
pdfReader = new PdfReader(pdf_src_filename); signedPdf = new
FileStream(pdf_dest_filename, FileMode.Create); pdfStamper =
iTextSharp.text.pdf.PdfStamper.CreateSignature(pdfReader, signedPdf, '\0',
null, true);
After my signature, the pdf file show a message box, it said: The
document has enable the Adobe Reader extension function, and it has been
changed since it be create.please contact the owner to get original version of
the document. Would you please give me some hint or help to solve
this problem. Thank You very much!
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