One of my favorite copy protections was in Space Quest IV (1991). You only had to enter it once, about 20% of the way into the game, and it was only one page of the instruction manual you’d have to photocopy. Not even any tricky colors or anything. Even though it was inserted into the story of the game (you had to enter an access code to start a vehicle), when the screen came up it said, “Okay, here’s the stupid copy protection.”