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https://issues.apache.org/jira/browse/PDFBOX-5765?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17816454#comment-17816454
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Andreas Lehmkühler commented on PDFBOX-5765:
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Maybe this is all about watermark annotations? BTW, those aren't supported by
PDFBox
> Not able to add watermark in PDF using Overlay
> ----------------------------------------------
>
> Key: PDFBOX-5765
> URL: https://issues.apache.org/jira/browse/PDFBOX-5765
> Project: PDFBox
> Issue Type: Bug
> Reporter: Tanmay Sharma
> Priority: Critical
>
> I am trying to add watermark to PDF. I am taking following two files as
> inputs:
> # Original PDF file: To which needs to be added.
> # Watermark PDF File: It is one page PDF which only contains watermark.
> I am trying to combine those files in Overlay to generate new document
> containing watermark in it.
> {code:java}
> PDDocument watermarkDoc = PDDocument.load(new File(".."));
> //Assuming your empty document with watermark image in it.
> PDDocument realDoc = PDDocument.load(new File("..."));
> Overlay overlay = new Overlay();
> overlay.setInputPDF(realDoc);
> overlay.setDefaultOverlayPDF(watermarkDoc);
> PDDocument document = overlay.overlay(new HashMap<Integer, String>());
> document.save("...")); {code}
> But when I try to open newly generated document in acrobat, though the
> watermark is displayed in the file, but Acrobat is not able to detect it.
> That is I am not able to perform any operation like update or delete
> watermark.
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