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https://issues.apache.org/jira/browse/PDFBOX-5191?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17342817#comment-17342817
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Larry Lynn commented on PDFBOX-5191:
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I am currently working on a patch for this bug. I don't think there is any
need for another developer to pick this one up.
> isEmbeddingPermitted() is too restrictive on TTFs with OS2 table versions 0-2
> -----------------------------------------------------------------------------
>
> Key: PDFBOX-5191
> URL: https://issues.apache.org/jira/browse/PDFBOX-5191
> Project: PDFBox
> Issue Type: Bug
> Components: PDModel
> Affects Versions: 2.0.21, 3.0.0 PDFBox
> Reporter: Larry Lynn
> Priority: Major
>
> PDFBOX-4882 fixed a bug that made isEmbeddingPermitted() too permissive. But
> it introduced a bug that made isEmbeddingPermitted() too restrictive for TTFs
> with OS2 table versions 0-2.
>
> TTFs with OS2 table versions 0-2 can have multiple permission bits set.
> According to the spec described in
> [https://docs.microsoft.com/en-us/typography/opentype/spec/os2#fstype]
> "in the event that more than one of bits 0 to 3 are set in a given font, then
> the _least-restrictive permission indicated take precedence_."
> Unfortunately, the current code essentially makes the most restrictive
> permission take precedence. This causes pdfbox to throw an error:
> "This font does not permit embedding"
> when attempting to process fonts that worked fine in pdfbox v2.0.20 and lower
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