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Recently I started to use Aspose library instead Pdf2PdfaPI for converting PADES (signed pdf) to Pdfa. Actually, I know, that it is no way to correct converting signatures to Pdfa, so before it was used like pdf …...Convert PDF to PDFA using C# and Aspose.PDF | Attachment is missing...Aspose.PDF Product Family pdf-to-pdfa mvesely May 14, 2021, 4:08pm...