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Steam no longer supports Windows 7, 8, and 8.1
(www.neowin.net)
This is a most excellent place for technology news and articles.
Steam isn't DRM, it's a game storefront/downloader that offers developers the option of DRM when they publish their game.
Plenty of games have zero DRM, and plenty of games do. I wish they'd make it clearer which do and which don't, but that's a separate issue.