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https://issues.apache.org/jira/browse/PDFBOX-1370?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13425706#comment-13425706
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Matthias Küng commented on PDFBOX-1370:
---------------------------------------

The issue thread you specified was the basis of my implementation. I reduced my 
code back so that it's practically the same and tried some input files. My use 
case always works with pdf files that have been saved by Microsoft Word 
(2007/2010). When I only have one page without an image it works but as soon as 
there is an image included or when there are multiple pages it doesn't work any 
more. When I create the file with bullzip it doesn't work too.
I have attached my test project with the input files in "resources" and the 
output in the "out" folder
                
> Only the last visual signature is valid when multiple signatures have been 
> added
> --------------------------------------------------------------------------------
>
>                 Key: PDFBOX-1370
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-1370
>             Project: PDFBox
>          Issue Type: Bug
>    Affects Versions: 1.6.0, 1.7.1
>            Reporter: Matthias Küng
>         Attachments: doublesigned.png, pdfbox-1370.zip
>
>
> * Every visual signature that is added invalidates the previous ones (Adobe 
> Reader displays the message that the document has changed)
> * If the signatures are added to different pages only the ones that have been 
> added to the page of the last one are visible in PDFReader (Adobe displays 
> the message in the signature view that the form field has been deleted)

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