Word 2007 Redaction Tool is an add-on to Microsoft Word that enables you to redact parts of a document, making it unreadable. Every selected word will be covered by a black box, making it impossible to read. Contrary to formatting (e.g., shadow) options included in Word, this will effectively erase the underlined text.
If you have ever seen spy movies you will probably be familiar with those confidential files where only a few words emerge from a black painted document. Every other line seems to have been covered with a large black marker. This application does exactly that, but in digital form.
The installation process has no options. After installing you will need to restart Word. You will have an additional Mark button on your Review tab. You will need to select all the text to be censured. There are directional arrows, allowing you to jump to the next selection, go back to the previous, or unmark everything. At this time the text will only be shadowed, allowing you to review your choice. After verifying you have the correct selection, click redact document and every word will be blacked out. Your document will still be perfectly editable.
There is a manual at the website to help you by every step of the way. Some security advices can be found there as well.