RBE does not use DRM but does use Amazon’s Kindle Market. Amazon has the largest market slice and most often offers the best prices, easiest delivery, and best reading apps and experience for readers, while also providing the simplest business relationship for RBE. Anyone, no matter the platform, wanting to read a RBE ebook can simply purchase it from the appropriate Amazon site and either read it in the free Amazon Kindle apps for any device, or convert it via Calibre, the free and excellent ebook conversion application for any device/platform/app. Of course, once read, RBE and all its authors and artists appreciate reader reviews. Thank you & Enjoy!