A few years ago I had to port a tool from HTBasic (a proprietary BASIC dialect) to Python. The original source only runs in their proprietary IDE. Of course, no comments whatsoever and a lot of GOTO magic and matrice calculations some of which have no other purpose as to confuse the reader. The variables had only cryptic and meaningless three digit letters. My theory is that they intentionally wrote it in a way that it would be a nightmare to reverse engineer. And they succeeded.