The document discusses the idea of using digital tethers to track data in the same way that falconers use leather restraints to track trained birds. It suggests that data could be digitally watermarked so that any unauthorized access or transfer could immediately alert the data's owner and allow them to track the data's location. Some existing technologies like GPS and digital watermarking could potentially be used to develop such a system. Having this kind of control over data could help address the growing problem of data theft by allowing owners to remotely wipe or self-destruct stolen data, and track down cybercriminals.