Ah, I was meaning "indefinitely" in the sense of "an unspecified period of time" :) Practically, it's very rare for games to disappear from a Steam library onc

Ah, I was meaning "indefinitely" in the sense of "an unspecified period of time" :) Practically, it's very rare for games to disappear from a Steam library once purchased. It happens for stolen/fraudulently purchased keys (eg keys bought with stolen credit cards), but for a whole game it's very rare. It has happened, but generally for games that relied on online servers for functionality and the servers have been taken down.