Q. What does Adobe DRM mean and which devices are compatible with it?

Adobe DRM is a digital rights management (DRM) system created by Adobe.  A digital rights management system limits the amount of copying, printing, and sharing of eBooks (and other online content like music and video games.)  Adobe DRM may also be called Adept, ADE, Adobe Digital Editions, or Adobe Reader Mobile.  Kindle is one of the only eReaders that is not compatible with Adobe DRM. A a list of devices that are is available on Adobe's page, Adobe Digital Editions Supported Devices