redacting text

Visible contents including text, graphics and images can be redacted. The appearance of redacted items can be modified. They commonly appear as colored.
Redacting a PDF seems like it would be the easiest thing in the world. Just draw one of those black boxes over the text you need to have.
The document I've just described hasn't been redacted at all. The text is still in the document. Anyone with the most basic knowledge of word. redacting text