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Now that I'm thinking about it, another frequently expressed criticism is that Steam is a DRM tool. A combination of the following three sources should be reliable enough: 1. INDICARE published an article about it (""But although there are mostly massive complaints about Valve's rigid usage control system, [...] It is alarming to see how little consumers have reacted to this practice and that it has not negatively affected sales of the game."") 2. Richard Stallman, mentioned as a notable DRM critic at Digital Rights Management#Opposition to DRM, called DRM'd Steam for Linux games ""unethical"". 3. Defective by Design says Steam's DRM violates users' freedom. 82.170.113.123  "