From the DE FAQ:
Quote:
Digital Editions is a specific RIA built on the current version of the Adobe Engagement Platform, including Adobe Flash® Player 9 and Flex™ 2 software.
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"RIA" is Rich Internet Application. In addition to XHTML, it also displays PDF - in fact currently most DE compatible e-books are probably PDFs. Note that Acrobat Reader 8 "no longer directly supports the Adobe Content Server (ACS) eBook digital rights management (DRM) solution". In other words, if you want to read an Adobe e-book, you must use DE.