Verify if a PDF is secured/protected with iTextSharp

问题

Is it possible to verify if we can copy the content of a PDF document with iTextSharp?

I have a method that copy the content of the PDF and add a new page at the end with project's information but it throw a "System.ArgumentException: PdfReader not opened with owner password". I get this error when I do writer.GetImportedPage(reader, i);

Thanks for the help!

回答1:

You should be able to just check the property PdfReader.IsOpenedWithFullPermissions.

PdfReader r = new PdfReader("YourFile.pdf");
if (r.IsOpenedWithFullPermissions)
{
    //Do something
}

来源：https://stackoverflow.com/questions/7251422/verify-if-a-pdf-is-secured-protected-with-itextsharp