While ereaders all have proprietary and license restrictions in some ways, Readium, is one promising open source option for many. The solution comes in two modes. One option is via the cloud and the other through the SDK. Although, the project is still in its infancy it is rapidly taking shape for EPUB3. Building even flexible native applications for the mobile can be an option. The project even looks so far as to integrate DRM across all domain contexts not just for ebooks. Content in all its shapes and forms needs to be open for all. It serves no purpose having so much content closed for access as the more available content is the more digital marketing one can attain from building the brand as well as consumer demand. Premium content doesn't have to be so restricted from extension and access. Content and Web APIs can provide the key to unlocking much of the data that publishing companies hold dear with additional revenue streams for more productive and flexible products. Even using standard HTML5 and PDF options can provide much benefits yet untapped.
