Signing PDF - PDF/3b compliance

问题

I'm trying to created a signed PDF/A-3b compliant PDF.

I've created a compliant PDF with iTextSharp and then after signing it is no longer compliant. I'm using PdfAStamper with a trial certificate. When opening the document in Acrobat it displays a dialogue box alerting the user that it is a test certificate. Using Acrobat Pro Preflight to check compliance I get the following error:

• Name object is not a valid UTF-8 string

  • Some PDF based ISO standards require that all name objects are UTF-8 encoded.

• Document details

  • Trigger values
    • Name objects is UTF-8 encoded: is not true
      • { 1 0 obj/Prop_Build/App/Name }

Is it the dialogue box that is causing this error or is it something else?

Many thanks in advance

来源：https://stackoverflow.com/questions/29777819/signing-pdf-pdf-3b-compliance