This is beautiful. The copy protection schemes on Stealth, Monkey Island, Another World, Alone in the Dark, and Indiana Jones are practically the appeal of the games themselves.
I didn't have video games growing up for economic reasons, so I missed out on these, but at the time, breaking copy protections was an unoffical national sport. Imagine solving these ciphers as a kid to upload keys to a warez bbs. It's unbelievable.
Also, wow, what a collection of retro games and software. I'm so jealous!