Copy protection got sophisticated very early, see http://www.filfre.net/2016/01/a-pirates-life-for-me-part-3-case-studies-in-copy-protection/ http://www.filfre.

Copy protection got sophisticated very early, see http://www.filfre.net/2016/01/a-pirates-life-for-me-part-3-case-studies-in-copy-protection/ http://www.filfre.net/2016/01/a-pirates-life-for-me-part-3-c... (Previous: http://www.filfre.net/2015/12/a-pirates-life-for-me-part-1-dont-copy-that-floppy/ http://www.filfre.net/2015/12/a-pirates-life-for-me-part-1-d... http://www.filfre.net/2016/01/a-pirates-life-for-me-part-2-the-scene/ http://www.filfre.net/2016/01/a-pirates-life-for-me-part-2-t...) For a in-depth look of one such protection system, you can read about a crack of an 1982 game for Apple II (Burger Time) here: https://ia600209.us.archive.org/8/items/BurgerTime4amCrack/BurgerTime%20%284am%20crack%29.txt https://ia600209.us.archive.org/8/items/BurgerTime4amCrack/B...