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https://issues.apache.org/jira/browse/PDFBOX-5765?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17816674#comment-17816674
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Tilman Hausherr commented on PDFBOX-5765:
-----------------------------------------
There's the source code. The properties you mention are from PDFBox. These are
not concepts of PDF itself. What PDFBox really does is to create an XObject
form and add that one to the resources and invoke this form. THAT is a PDF
concept. To understand more, look at your file and an Adobe file with the
PDFDebugger tool.
> 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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