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https://issues.apache.org/jira/browse/PDFBOX-2577?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14253178#comment-14253178
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Timur Kamalov commented on PDFBOX-2577:
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Yes, it's Encoding, fixed this mistake.
> Preflight : no check for "Differences" entry in "Encoding" dictionary
> ---------------------------------------------------------------------
>
> Key: PDFBOX-2577
> URL: https://issues.apache.org/jira/browse/PDFBOX-2577
> Project: PDFBox
> Issue Type: Bug
> Components: Preflight
> Reporter: Timur Kamalov
>
> PDF/A-1 spec, subclause 6.3.7 Character encodings
> Due to Technical Corrigendum 2 the entire subclause is replaced with
> All non-symbolic TrueType fonts shall specify MacRomanEncoding or
> WinAnsiEncoding, either as the value of the Encoding entry in
> the font dictionary or as the value of the BaseEncoding entry in the
> dictionary that is the value of the Encoding entry in the font
> dictionary. If the value of the Encoding entry is a dictionary, it shall not
> contain a Differences entry. All symbolic TrueType fonts shall
> not specify an Encoding entry in the font dictionary, and their font
> programs' “cmap” tables shall contain exactly one encoding.
> PDFBox doesn't perform a check on Differences entry.
> Test case can be isartor-6-3-7-t01-fail-a
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