The recommended e-reader software for MIT Press ebooks is Adobe Digital Editions for a PC or Macintosh computer, and Bluefire Reader for PC, iOS and Android devices. While not required, it is recommended that users create an Adobe ID. By creating an Adobe ID, users can sync their ebook purchases across multiple devices, such as desktop computers, laptops, tablets, and smartphones. Because many ebooks contain digital rights management (DRM), once they are downloaded to one device, they can't be read on another unless purchased specifically for that device as well. Creating an Adobe ID solves that issue by unifying all purchases in one account that can be accessed on all of a user's devices.