Convert PDF to PDF/A3 or PDF/A-1 to PDF/A-3
问题 I'm testing iTextSharp to generate ZUGFeRD-Files. My first step was to generate a ZUGFeRD conform file from an existing PDF/A-3 file. This was successfull by using PDFACopy and creating the necessary PDFFileSpecification. The next step would be to generate a PDF/A-3 file from an existing PDF or PDF/A-1 file and this is the hard part. First, when I'm trying to use PDFACopy in combination with a regular PDF (not PDF/A) im getting an error that PDFACopy can only be used with PDF/A-conform files.