Two ways to black out a name in a PDF look identical on screen and are entirely different files. One deletes the text and draws a box; the other just draws the box. Here is how to tell which one you have, and why the difference is paint order.
There are two ways to black out a name in a PDF.
The first deletes the text and then draws a black rectangle where it used to be.
The second just draws the black rectangle.
On screen they are indistinguishable. In the file they are entirely different
documents, and in the second one every character of the name is still there —
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