In the late 1990s and early 2000s, optical discs were the undisputed kings of software distribution. To combat rampant piracy, game publishers implemented various forms of CD-ROM copy protection. The most basic of these required the physical game disc to be present in the computer's CD drive while the game was running. Quake III Arena
Quake 3 Arena is available on Steam, GOG, and the Bethesda Launcher, offering a straightforward way to play the game without any CD issues. Quake 3 Arena No Cd Patch