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https://issues.apache.org/jira/browse/PDFBOX-2624?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14299754#comment-14299754
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Maruan Sahyoun commented on PDFBOX-2624:
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For PDF/A-1
{quote}
For all CIDFont subsets referenced within a conforming file, the font
descriptor dictionary shall include a CIDSet stream identifying which CIDs are
present in the embedded CIDFont file, as described in PDF Reference Table 5.20.
{quote}
as PDF/A-2 clarified it a little more I’m adding the bit too for reference
{quote}
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.
NOTE 3 The above requirement makes normative the statements in ISO
32000-1:2008, 9.8.3.1, Table 124.
{quote}
If I’m not mistaken we need to validate the content of the CIDSet too.
> "CIDSet entry is missing for the Composite Subset" when creating PDF/A-1b
> file with PDType0Font.load()
> ------------------------------------------------------------------------------------------------------
>
> Key: PDFBOX-2624
> URL: https://issues.apache.org/jira/browse/PDFBOX-2624
> Project: PDFBox
> Issue Type: New Feature
> Components: PDModel, Utilities
> Affects Versions: 2.0.0
> Reporter: Tilman Hausherr
> Fix For: 2.1.0
>
> Attachments: PDFBOX-2624.pdf, cidset.patch
>
>
> PDTrueTypeFont.loadTTF() is deprecated. So I tried to change CreatePDFA.java
> to call PDType0Font.load() instead, but the preflight validation fails:
> {quote}
> 3.1.11: Invalid Font definition, AAAXQL+LiberationSans: The CIDSet entry is
> missing for the Composite Subset
> {quote}
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