The context where I've most often met this word is also not in the dictionary: adapting an old recipe to modern use is called 'redacting' or 'redaction'. Question: Is the word here really redact? My dictionary defines redact as edit text for publication.

Context Explanation

Is there another word that describes the action you highlight in your question? The current use of redact often includes image redaction, especially when discussing electronic files such as Word or PDF documents. The NSA Redacting with Confidence guide (note, 1.4MB PDF available from NSA index) discusses redacting images - for example: Select each chart, diagram, image, or segment of text to be redacted and delete that item. Can an image be redacted, or just text?

Insight Material

- English Language & Usage ... Although the dictionary definition of redact includes a meaning synonymous with edit, that meaning is all but unknown in the US, and the vast majority of readers would take the term to mean the removal (censorship) of "sensitive" information and nothing more. In that vein, redactor would be synonymous with censor. To redact means to edit for publication. You might say sanitizing is redacting with a particular purpose.

Final Conclusion

As with redaction, neither of these verbs specifically refer to the use of a black box. For that, common verb phrases are mark out, black out, cover up. (3) The security officer blacked out (or marked out) the driver’s address. I think it's worth mentioning "redact" as a relevant word. It does have meaning beyond the typical government-censorship connotation. No, redact refers to sensitive or confidential information, rather than offensive, and it means totally removed/obscrued/blacked out, rather than creatively obfuscated (but the words can still be deduced).