A printed book is a finished object. Once inked onto the page, its words become indelible. The finality of the act of publishing has long instilled in the best and most conscientious writers and editors a desire, even an anxiety, to perfect the works they produce—to write with an eye and an ear toward eternity. Electronic text is impermanent. In the digital marketplace, publication becomes an ongoing process rather than a discrete event, and revision can go on indefinitely. Even after an e-book is downloaded into a networked device, it can be easily and automatically updated—just as software
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