This is a corporate policy issue. 80% of commercial trade book publishing in the US/UK/EU is dominated by five multinationals, the "Big Five" -- Penguin Random

This is a corporate policy issue. 80% of commercial trade book publishing in the US/UK/EU is dominated by five multinationals, the "Big Five" -- Penguin Random House, Simon and Schuster, Macmillan, Hachette, and HarperCollins. Corporate policy at all of these companies except Macmillan absolutely requires DRM on digital products, no exceptions permitted. This policy comes from boardroom level and trickles down to contaminate every department. Remember, most of these companies are in turn subsidiaries of organizations with interests in other media: news, TV, film, and so on. DRM infected them decades ago and any attempt to change direction on it would be an admission of policy failure, which is the kiss of death to an executive career.) Macmillan, the smallest -- and the English language arm of German conglomerate Holtzbrinck -- is privately owned, so not vulnerable to activist shareholders: they listened to their authors and publishers several years back and a number of their imprints publish DRM-free. Other than that, many small/indie publishers gave up on DRM years ago. But they may not have what you want ...