PDFlib 8 Windows COM/.NET Tutorial

Encrypted PDF documents without the corresponding password (exception to the
infomode rule: PDF 1.6 documents created with the Distiller setting Object Level
Compression: Maximum; these cannot be opened even in info mode).
> Tagged PDF when the tagged option in begin_document( ) is true.
> PDF/A or PDF/X documents which are incompatible to the PDF/A or PDF/X level of
the current output document (e.g. trying to import PDF/A-1a into a PDF/A-1b document).
See Section 10.3.4, »Importing PDF/X Documents with PDI«, page 258, and Section
10.4.3, »Importing PDF/A Documents with PDI«, page 264, for more information.
The following additional checks are done in open_pdi_page( ):
> PDF documents which use a higher PDF version number than the PDF output document
that is currently being generated can not be imported with PDI. The reason is
that PDFlib can no longer make sure that the output will actually conform to the requested
PDF version after a PDF with a higher version number has been imported.
Solution: set the version of the output PDF to the required level using the compatibility
option in begin_document( ).
PDF 1.7ext 3 (Acrobat 9) and PDF 1.7ext8 (Acrobat X) documents are compatible with
PDF 1.7 output as far as PDI is concerned (note that Acrobat X encryption is not yet
supported).
In PDF/A mode the input PDF version number will be ignored since PDF version
headers must be ignored in PDF/A.
7.2 Importing PDF Pages with PDI 191