That is interesting; I did something like this decades ago for a former employer. To give an idea of the era, all the developers worked on green-screen dumb ter

That is interesting; I did something like this decades ago for a former employer. To give an idea of the era, all the developers worked on green-screen dumb terminals (PCs were still a fairly expensive thing for a small business like this one - we had a few for training purposes, and our sysadmin had one - and that was about it; our main dev machine we hooked up to was a IBM RS/6000 workstation running AIX). In the source code, in comments I'd put in a varying number of spaces to spell out a copyright phrase; that way, if some comments were removed, it would mostly still be present. It was later used to defend a case of stolen code from what I recall, though I had moved on from that company by then. It wasn't as sophisticated as this, though; IIRC, mine was just a number of spaces to indicated basic symbols to spell out the phrase and nothing more. At the time, I was 19 years old, and hadn't been doing software dev for very long - young and naive, though that had its advantages back then.