How do I detect PDF files protected with Adobe LiveCycle Rights security?

[Support]

Q:
Some of our PDF files are protected with custom DRM encryption (e.g. Adobe LiveCycle Rights security).
How can I detect PDF files protected with Adobe LiveCycle Rights security ?

 

-------

A:

 

You can use the following snippet to detect files with custom encryption (including Adobe DRM):

 

PDFNet.Initialize();

Try {

      using (PDFDoc doc = new PDFDoc("my.pdf"))

      {

            try {

                  if (!doc.InitSecurityHandler()) {

                        Console.WriteLine("Document authentication error...");

                  }

            }

            catch(PDFNetException e) {

                  Console.WriteLine(e.Message);

                  Console.WriteLine(doc.GetTrailer().Get("Encrypt").Value().Get("Filter").Value().GetName());

            }

      }

}

catch (PDFNetException e) {

      Console.WriteLine(e.Message);

}

 

The output will be:

 

 

Exception: Requested security handler was not found.

Adobe.APS

 

 

So doc.InitSecurityHandler() will throw an exception if there is no matching security handler for a given filter name (in this case “Adobe.APS”). 

For this to work you may need to use the latest PDFNet build (v.5.8.2 or higher):