Location is a trick but there are other ways apart from location. Old tech has been forgotten.
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I built a punched tape storage based on existing tapes I found at the University in late 80's. It writes codes on a paper roll. I added a simple hardware bytes coder inverting bits and I bet no people with today tech will decode it.
https://www.storagenewsletter.com/2018/09/03/history-1846-punched-tape/