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Rule of owning
(lemmy.ml)
Be sure to follow the rule before you head out.
Rule: You must post before you leave.
Well that's just digital goods, not Steam specifically.
You do get all the files for the game, that will work for as long as the OS will run them, with or without Steam (this is as close as you can come to ownership for software). Rather than a license to use them files, which become useless if you don't run the game through Steam.