Back in the day (1994?), Quake 1 came out on CD. The disc contained the playable demo (since its few megabytes were overwhelming to download via 14.4kbps modems of the day). However, the disc also contained demos and full versions of nearly all id software games at the time.

The full versions of the games could be unlocked by purchasing a license key by phone. Sure enough, about 32 seconds after release, a crack came out to unlock the entire disc.

All popular id software games for the $5 cost of a shareware CD. Though, upon cursory check, I can't find that disc now...