Back when CD-ROM was a main thing, I remember that sometimes on games you could insert the CD, launch the game, and then remove the CD, the game would still run (I believe that was the case for Age of Empires 2 for example).
How was this possible?
In: 3
It was just an early form of copy protection. You’d install the game from the CD to your PC, but it would not install some validation file of some description. Then, when you start the game, it would check for said validation. Once it’s done with that, it no longer checks, and you just run it from your hard drive. The point was, obviously, to require you to have the CD, such that you can’t use one CD to install the game on as many PCs as you want, and thus gain a free copy. Worked about as well as most copy protections, meaning very poorly.
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