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https://issues.apache.org/jira/browse/FOP-2910?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17032331#comment-17032331
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Roberto Benedetti commented on FOP-2910:
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I tried with the "Source Sans Pro" otf font that can be found in test resources
of the project. The configuration and fo is in [^otf.zip].
The PDF is valid thanks to what it seems a trick: the font name (/FontName) is
that of a fully embedded font (i.e. without the random sequence as a prefix)
but obviously it is not. Even Acrobat Reader thinks it's fully embedded.
The veraPDF test is:
{{fontFile_size == 0 || fontName.search(/[A-Z]\{6}\+/) != 0 || CIDSet_size == 0
|| cidSetListsAllGlyphs == true}}
which shows the condition on the font name prefix.
> Create valid PDF/A part 2 or 3 with font subset
> -----------------------------------------------
>
> Key: FOP-2910
> URL: https://issues.apache.org/jira/browse/FOP-2910
> Project: FOP
> Issue Type: Improvement
> Components: renderer/pdf
> Affects Versions: 2.4
> Environment: OS: Windows 10
> Java: 1.8
> Reporter: Roberto Benedetti
> Priority: Major
> Attachments: otf.zip, samples.zip
>
>
> When creating PDF/A-2a or PDF/A-3a with font embedding mode "subset" the
> resulting PDF in not valid according to veraPDF which reports:
> ??Specification: ISO 19005-3:2012, Clause: 6.2.11.4, Test number: 4. If the
> FontDescriptor dictionary of an embedded CID font contains a CIDSet stream,
> then it shall identify all CIDs which are present in the font program,
> regardless of whether a CID in the font is referenced or used by the PDF or
> not.??
> Embedding the complete font seems to solve the validation error but resulting
> files are very large.
> When exporting files as PDF/A from Microsoft Word the PDF is valid and it
> only contains a subset of the font.
> The only difference I noticed is that Word does not create a CIDSet.
> File [^samples.zip] contains two PDF/A-3a created by Word and the files used
> to create the same PDFs with FOP.
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