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https://issues.apache.org/jira/browse/TIKA-1759?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14940158#comment-14940158
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Tilman Hausherr commented on TIKA-1759:
---------------------------------------

Sorry, I can't help you with that one, because I haven't worked with that part 
of the PDF spec. You'll have to ask the whole gang or look for yourself with 
PDFDebugger.

> Extract contributor metadata from supporting file formats
> ---------------------------------------------------------
>
>                 Key: TIKA-1759
>                 URL: https://issues.apache.org/jira/browse/TIKA-1759
>             Project: Tika
>          Issue Type: Improvement
>            Reporter: Tim Allison
>            Priority: Minor
>         Attachments: contributors.zip
>
>
> Many common file formats store information about contributors (broadly 
> speaking) to a document.  We are currently extracting author/creator and 
> modifier/last author.  Let's add extraction for:
> # comment authors
> # revisers (authors who make changes with track changes on)
> # signers



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