The ESBN database launches. The Electronic Standard Book Number (ESBN) is the unique identifier of electronic media. "An ESBN is used to establish and identify one downloaded or issued copy of electronic media such as an e-book, digital document, and streaming audio/video." As David Weinberger comments, cynically (but probably accurately), "It's all part of the attempt to impose the restrictions of the physical on the digital, enforcing scarcity where there is none." More background from Weinberger.