Redaction
Permanently removing information from a document, usually with a solid opaque box.
Redaction means removing information from a document so it cannot be recovered. In an image or PDF that means a solid, opaque box burned into the exported file, not an annotation layer placed on top.
Blur and pixelation are not redaction. They transform the original pixels in a predictable way, so they can sometimes be reversed. Every redaction should be recorded in a log with its page and reason, because an unexplained gap looks like tampering.
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In practice: How to redact names in screenshots