"I selected the Drumlin system following a long search and had several good reasons for doing so. Chief among these is the ability to utilize complex graphics, especially high-resolution photos. This is thanks to use of Adobe Acrobat pdf files as the foundation. My pictorial books were otherwise out of the running for commercially available ebooks featuring robust DRM, and all of my books retain exactly the formatting values I can build in to pdf presentation. Of course, having a robust DRM is key factor. Ease of set-up for new files is important, as is the fact that the software is free and that the learning curve is short. Drumlin is receptive to adding new features based on customer demand; I asked for bookmarks, and the bookmark feature became available in a few days! Another vital feature gives me complete control over assigning activation codes direct to my customers. All in all, I'm happy with the choice and I plan to make continued use of the Drumlin system as the stand-alone ebook reading system available to my customers."