"I personally recommend blacking out (add a black rectangle) instead of blurring, and if it is a PDF, convert to an image afterwards because too many PDF editor

"I personally recommend blacking out (add a black rectangle) instead of blurring, and if it is a PDF, convert to an image afterwards because too many PDF editors use non-destructive operations to add a new object instead of changing what's underneath." I have this at work, with engineering drawings. With mobile equipment often were not dealing with engineering companies per se, and they won't or don't know how to get us CAD models of their equipment. And we often don't have the equipment on have at the time we need to make drawings. But if you have a PDF with vector drawings, often a manual, and one or two good dimensions you can make a reasonably accurate model. AutoCAD even makes this easy with the PDFIMPORT function. More often than I would expect, there's a whole other drawing view either covered by a white box or off-page. Once it looked like it had been drawn over with a white paintbrush tool, and if course the path of that too was also visible.