N THE DIGITAL AGE, PEOPLE TRADE CONVENIENCE FOR CONTROL ALL THE time. Digital systems offer highly efficient means of leading lives in networked societies around the world. These conveniences enable consumers to buy more things that they want (or that marketers think they ought to want), voters to participate in civic life more easily, bureaucracies to offer shorter lines for the provision of services or payment of bills, employers to squeeze greater productivity out of their employees, doctors to provide better health care to their patients, and so forth. Taken together, all the digital information held, in many different hands, about a given person makes up his or her digital dossier.1
The primary cost of progress toward greater ...