I forgot to tell you another interesting tidbit regarding highly classified documents. Spelling and grammar errors were often introduced purposely in the text. Each copy, manually prepared, contained a different mistake. Records were kept that tracked who viewed or "checked out" which copy. If the information were disclosed they could narrow the field of suspects merely by seeing which "tracers" were present in the leaked information. Also, people tend to correct spelling and grammar errors when they copy documents, so the absense of those "tracers" could also be used to narrow the search for the leak.
These are techniques the Army teaches.
I forgot to tell you another interesting tidbit regarding highly classified documents. Spelling and grammar errors were often introduced purposely in the text. Each copy, manually prepared, contained a different mistake. Records were kept that tracked who viewed or “checked out” which copy. If the information were disclosed they could narrow the field of suspects merely by seeing which “tracers” were present in the leaked information. Also, people tend to correct spelling and grammar errors when they copy documents, so the absense of those “tracers” could also be used to narrow the search for the leak.
These are techniques the Army teaches.
YUP!