I've heard that just visually blocking them isnt enough or something.

There's probably a whole world of metadata silently attached that gets passed over often

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[โ€“] 8 points 21 hours ago (3 children)

Most surefire way would be to turn the pages into images, paint over the images and then stitch the images together as a new PDF. The low tech version would be to print them out, put something that's fully opaque over the undesirable sections and scan them back in.

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  • [โ€“] 4 points 18 hours ago (2 children)

    Cut out the sections to be censored I think. Stuff might show up under high contrast.

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  • [โ€“] 1 point 4 hours ago (1 child)

    Yeah, some redaction tools simulate a marker and its not fully opaque. Some add a black rectangle object over top, and if you load into libredraw you can delete the rectangles and see the text underneath. Best way is image capture and coallate back into a PDF

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