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https://issues.apache.org/jira/browse/PDFBOX-1181?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13811697#comment-13811697
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Frank Cornelis commented on PDFBOX-1181:
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The PDFBOX-1513 patch includes this.

> Support for document time-stamp in COSWriter
> --------------------------------------------
>
>                 Key: PDFBOX-1181
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-1181
>             Project: PDFBox
>          Issue Type: Improvement
>            Reporter: Frank Cornelis
>         Attachments: COSWriter-DocTimeStamp.patch
>
>
> When reusing the SignatureInterface to add a document time-stamp (PAdES) to a 
> PDF, you have to change the signature dictionary type from "Sig" to 
> "DocTimeStamp" (or simply drop the Type) according to the ETSI TS 102 778-4 
> V1.1.2 specification. If doing so, the COSWriter is no longer capable of 
> detecting the signature location.



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