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https://issues.apache.org/jira/browse/PDFBOX-4887?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17137823#comment-17137823
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Tilman Hausherr commented on PDFBOX-4887:
-----------------------------------------
Sadly, you can't embed fonts from TrueType collections for forms because "not
subsetting" isn't supported.
PDFBox fails to detect that this is a TTC file. While these can be used as
TrueType fonts logically and subsetting works, they can't be embedded as
individual full TrueType files, because PDFBox has no such feature (in theory,
one might implement it by expanding TrueTypeEmbedder; but you can convert ttc
files to ttf with online converters). And the PDF specification does not
support TTC files. Solution: PDFBox must detect this. That is easy, because TTC
files begin with "ttcf".
> Using the same font fully embedded in plain text and PDTextField, it throws
> an exception in PDTextField.setValue
> -----------------------------------------------------------------------------------------------------------------
>
> Key: PDFBOX-4887
> URL: https://issues.apache.org/jira/browse/PDFBOX-4887
> Project: PDFBox
> Issue Type: Bug
> Affects Versions: 2.0.19
> Reporter: bai yuan
> Priority: Major
> Attachments: image-2020-06-16-12-25-47-482.png, msyh.ttc, pdfbox.java
>
>
> # Run the code in the attachment(pdfbox.java).
> # The exception as follows: !image-2020-06-16-12-25-47-482.png!
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