User-1330468790 posted
Hi inkaln,
You could use iTextSharp with the PdfReader
as a workaround.
Here is a solution from stackoverflow.
The problem with using the PdfReader.IsEncrypted method is that if you attempt to instantiate a PdfReader on a PDF that requires a password - and you don't supply that password - you'll get a BadPasswordException.
Keeping this in mind you can write a method like this:
public static bool IsPasswordProtected(string pdfFullname) {
try {
PdfReader pdfReader = new PdfReader(pdfFullname);
return false;
} catch (BadPasswordException) {
return true;
}
}
Note that if you supply an invalid password you'll get the same BadPasswordException when attempting to construct a PdfReader object. You can use this to create a method that validates a PDF's password:
public static bool IsPasswordValid(string pdfFullname, byte[] password) {
try {
PdfReader pdfReader = new PdfReader(pdfFullname, password);
return false;
} catch (BadPasswordException) {
return true;
}
}
Sure it's ugly but as far as I know this is the only way to check if a PDF is password protected. Hopefully someone will suggest a better solution.
Reference:
https://stackoverflow.com/a/11300144/12871232
Hope helps.
Best regards,
Sean
