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Do you actually own anything digital?
(www.theregister.com)
This is a most excellent place for technology news and articles.
Sort of, but only if you're launching through Steam. You can launch DRM-free Steam games through the executable file without launching Steam if you already have the files downloaded.
Games on Steam don't require Steamworks or any other DRM, if your game won't launch without Steam running that's a choice by the game developer and not a restriction imposed for Steam.