https://bugs.documentfoundation.org/show_bug.cgi?id=160196
Bug ID: 160196
Summary: Combined "Hybrid PDF" and "Archival PDF" options
generate non-conformant PDF/A files
Product: LibreOffice
Version: 24.2.1.2 release
Hardware: All
OS: All
Status: UNCONFIRMED
Severity: normal
Priority: medium
Component: LibreOffice
Assignee: [email protected]
Reporter: [email protected]
LibreOffice 24.2 release allows a user to check both(!) the "Hybrid PDF (embed
ODF file)" and "Archival (PDF/A, ISO 19005)" options. However the resultant PDF
can NEVER BE COMPLIANT to PDF/A-1 or PDF/A-2 for any conformance levels as
embedded files are not permitted by any of these older PDF/A standards.
You need to use PDF/A-3 (ISO 19005-3:2012) - quoting introduction of PDF/A-3:
"This part of ISO 19005 adds a new goal (beyond that of ISO 19005-2) which is
to enable PDF documents to serve as containers for other file formats, so that
a single physical file can contain not only the visual representation but also
other representations including the original authored version, richer semantic
formats, and others. This part of ISO 19005 does not address the long-term
suitability of formats, that may be embedded, other than those compliant with
any part of this International Standard." - see
https://www.iso.org/obp/ui/en/#iso:std:iso:19005:-3:ed-1:v1:en
Without checking the details of every possible PDF output that LibreOffice
might generate, it is probably safe (or at least very very close) to simply
change the XMP metadata conformance information to be PDF/A-3 instead of
PDF/A-2 for this situation. Of course, you should validate the generated PDFs
with a tool such as veraPDF to check conformance.
PS. When you look at PDF/A-3, also read Annex E "Associated Files", since the
embedded ODF file is the "source" of the PDF export so additionally adding the
AF entry to the DocCatalog with an AFRelationship key value of Source.
Associated Files were also directly adopted into PDF 2.0 (ISO 32000-2) to
facilitate open data transfer and are being used by the likes of LaTeX for
MathML, etc. A few PDF readers are also now supporting Associated Files in
their attachment panes.
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