How does Adobe Digital Editions differ from Adobe Reader and Acrobat®?
Acrobat is the complete solution for creating and manipulating Adobe PDF documents. However, Reader supports a variety of workflows beyond consuming eBooks and other commercially published content. As a result, the power, complexity, and size of Reader are not optimized for consumer-level eBook reading. ADE is distributed as a web-based RIA, ensuring that users will always have the current version of the software. PDF and EPUB content with server based DRM applied to them can be opened only in ADE. If user tries to open licensed file of DRM (URLLink.acsm) in Reader or Acrobat, following error is shown.