This comment has been redacted :)

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Things about redaction which no one else seems to know:

1. It's done with a marker, not a font or a piece of software. The black bars tend to be made of assorted scribbles - the scribbling process helps to obscure the relief left in the paper by the original writing/printing. So the real thing tends to look much messier.

2. It's done so that one cannot surmise the length of the blacked-out area. Simply replacing existing text with black spaces does not work. That will give an enemy or spy the ability to infer the contents of the block by its length. This is especially true when the redaction is being used to cover a font that's monospaced.

3. Documents which have redacted information in them tend to be edited and reprinted so that the redacted areas do not appear at all.

4. Redaction is very rare. In general people tend to restrict access to materials rather than cover them with redaction marks. If information in a document becomes more sensitive than it was previously, the document will be moved somewhere more secure.

I hope someone puts these suggestions to good use... the existing cultural perceptions of redaction and how it works are missing quite a few of these facts...