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