> By June 1996, after three years of hard work, id Software had completed their next title, Quake. As for their previous title, they were going to release both a shareware version and a full version of their game. Since it used a mere 22 MiB of storage, people at id Software had the idea of leveraging the remaining capacity of a CD-ROM. Why not include encrypted versions of the full id catalogue of games? Not only this would cut out the middlemen, it would give instant access to gamers with a simple phone call and a credit card.

That wasn't a new idea at the time. In 1994 Apple distributed a "software store" CD-ROM called Software Dispatch that implemented the same idea: https://68kmla.org/bb/threads/apple-software-dispatch-from-1.... The thing was full of demos, and if you wanted to buy the full version, you just had to call some number to get an unlock code.

I think I had at least one other CD-ROM that implemented the same concept. I'm sure there were tons of others.