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https://issues.apache.org/jira/browse/PDFBOX-3169?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15059994#comment-15059994
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Maruan Sahyoun commented on PDFBOX-3169:
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If I understand correctly that patch is necessary because of the current 
(limited) way PDFBox handles incremental updates? So we still need full 
incremental update support.

> SaveIncremental does not work without signature
> -----------------------------------------------
>
>                 Key: PDFBOX-3169
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-3169
>             Project: PDFBox
>          Issue Type: Bug
>          Components: Writing
>    Affects Versions: 2.0.0
>            Reporter: Thomas Chojecki
>            Assignee: Thomas Chojecki
>         Attachments: saveIncremental.patch
>
>
> I know this feature is ongoing, but with the 2.0.0-RC builds the 
> saveIncremental (without signature) stop working at all. A 
> ByteArrayOutputStream is used in the COSWriter for output. This OutputStream 
> will only be handled in the case, when we write a signature. Otherwise the 
> whole content will be discarded.
> As I wrote some time ago on the mailinglist, incremental update work in a 
> limited way. At the moment we use it for augmenting signatures and this works 
> with the old 1.8.x but not with trunk after the patch PDFBOX-1847 was applied.



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