If you own a physical book, in much of the world you may sell it, lend it—even burn or bury it. You may also keep the book forever. Each of those characteristics is littered with footnotes and exceptions for e-books. We are granted an illusion of ownership, but may read only within the ecosystem of hardware and software supported by the bookseller with sometimes additional limitations imposed by publishers.
An Economist article on ebook and ebook readers.
