![]() converting ] the PDF document to multiple TIFF image files.With a black rectangle or by using black text highlighting covering ] each item of confidential information. ![]() The process of redacting in PDF involves: The Almost Same Process is listed in this Document : Since somebody thought that there is something wrong in this Answer. UPDATE (to include Supporting Material) : (3) Stitching these Images into a set of Pages to share & view. (2) Convert the whiteout Pages to Images using some tools (Paranoid users might want to (2A) Check the generated Images & (2B) Eliminate all unwanted Meta Data, especially Comments & Annotations) (1) Add the white-out (either by Placing Square on top layer or by Blackening the text) The Best way (with a guarantee that the content is "gone") would be : If you are using Proprietary Tools, you have no guarantee what the tools will be doing to "optimize" the workflow & what Meta Data gets retained in conversions.Įg 1 : If there are layers of text below the layers of Images (to "assist" text-2-speech users) then whiteout may be undone.Įg 2 : If the tools want to include text to enable "text search" of the Images, then the text may be there in some Meta Data like Comments or Annotations.Įg 3 : Certain tools store revision history (to help "undo & to "audit") & these may leak the unwanted text.Įg 4 : Some tools generate Caches & Indexes (to help users with quick output) which may reveal unwanted text. So, I'm hoping that someone (reading this) has the knowledge (or resources) to confirm definitively whether or not this technique is indeed a reliable way to ensure that private edits to a PDF document cannot be revealed by any advanced techniques. I don't have an advanced PDF editor to confirm this. This may be very important to some people, so I want to ensure I'm correct about this advise. Since the PDF is not just an embedded image (without text), now I'm not so sure that the whiteouts cannot be undone by an advanced PDF editor. However, while testing, I noticed that the PDF, produced by "Microsoft Print to PDF", has text that I can highlight, copy, and paste from the PDF. In the latest Foxit Reader, the steps to whiteout content have changed. In this case, it is impossible for the recipient to undo the whiteouts, because the PDF doesn't even contain the content that was underneath the whiteout modifications. In other "Print to PDF" virtual printers, that I've used in the past, the file produced is one where all the text from the source document gets converted to an image, and the only thing contained in the new PDF (generated), is an embedded image of how the document looks after the whiteout modifications. A while back, I made a video that shows how to whiteout content in a PDF file using Foxit Reader.Īfter whiting out content, I advised that you could prevent "a recipient of that PDF" from undoing your whiteouts (using some advanced PDF editor) by simply printing the document to a new PDF, using the "Microsoft Print to PDF" virtual printer.
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