This article notes ways that power is central to questions of personal information access and use. New surveillance technologies are likely to sustain and even strengthen traditional forms of social stratification. Yet power is rarely a zero-sum game. A number of factors that limit unleashing the full potential of privacy-invading technology, even in contexts of inequality, are considered: legal and moral normative constraints on power holders; the logistical and economic limits on total monitoring; the interpretive, contextual, and indeterminate nature of many human situations; system complexity and interconnectedness; human inventiveness; and the vulnerability of those engaged in surveillance to be compromised or responded to in kind.