Searching for "classified" content in documents
Sensitive government and military organizations classify their documents with familiar terms like "TOP SECRET" and also less well known terms like "NOFORN" (which means the data can't be shared with any foreign nationals).
These terms and phrases are usually placed in the headers and footers of every page in electronic documents. Most organizations that deal with extremely sensitive data have mandatory requirements for documents to be labeled according to their classification levels.
At the Tenable blog.
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