The initials DRM stand for "digital rights management." The audiobook you receive as a reward, whether download or physical CD, will be DRM-free. This means you are free to install and use the audiobook on any device you own. All Skyboat's publications that are distributed with our favorite co-publisher, Blackstone Audio, are DRM-free. That's why when people ask us where to buy their audio, we say www.downpour.com.