Tor (US) and Tor (UK) are both DRM-free but they have different catalogues, so you can get more DRM-free books if you buy from both.
E.g. Peter F. Hamilton's UK editions are DRM-free (Tor UK) but his US editions have DRM (Random House). Gene Wolfe's US editions are DRM-free (Tor US) but the UK editions have DRM (Hachette).
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