Really interesting article in Electronic Frontier Foundation site. The article talks about various rights issues that the user should think about before buying a digital books.
Some of the issues covered by author
Author points out the fact that when you buy these e-books you most of the time are just buying the license to the book
Many readers expect that the same rules will apply to their e-book purchases. However, electronic books have often been treated as “licensed” content, subject to legal and technical restrictions (primarily, DRM) that block readers’ ability to resell, lend, or gift an e-book. More ominously, last year Kindle readers realized that their provider (Amazon) could actually reach down into their devices and pull books from their virtual shelves
Complete article here