The OECD has released E-books: Developments and Policy Considerations.
Here's an excerpt:
The essential distinction between permanent and effective ownership of a physical book, and conditional rights of access to the e-book, has, so far, been somewhat obscured by marketing strategies and use of visual images, which tend to present e-books as a superior, but also substitutable, version of the print book product. Given the virtual reality of "traditional books" presented by e-Book platforms, buyers of e-books are likely to confuse their rights (i.e. after purchase) with the property rights model for print books. Users may be surprised to find that they are prevented from doing certain things7 with their e-book, within their private/ personal sphere.