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https://issues.apache.org/jira/browse/PDFBOX-5211?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17361384#comment-17361384
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yoonho commented on PDFBOX-5211:
--------------------------------

[~tilman]

The problem has been resolved. It has been confirmed that this file is 
successfully applied to other files as well. Where can I go for a description 
of an object like "PieceInfo"? I couldn't find an explanation in the doc 
related to COSName. If there is a document related to the role and purpose of 
an object, it would be very helpful to me. Thank you.

>  How can I clear unused data?
> -----------------------------
>
>                 Key: PDFBOX-5211
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-5211
>             Project: PDFBox
>          Issue Type: Wish
>         Environment: mac os
>            Reporter: yoonho
>            Priority: Major
>         Attachments: 스크린샷 2021-06-10 오후 8.08.39.png
>
>
> How can I delete unused elements (for Photoshop, for InDesign, etc) within a 
> PDF file?
> After applying Adobe DC's optimization options (I posted in the screenshot), 
> I found that a pdf file of 380mb was reduced to around 48mb. This feature is 
> very useful to me. How can I implement it with pdfbox?
> I tried several ways, but couldn't find a way. I need advice.



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