theodp writes "Bill Gates and Ray Ozzie are listed as inventors of the Guardian Angel, which is described in a most unusual Microsoft patent application that should intrigue privacy advocates. In addition to protecting you from possibly diseased people, by detecting body temperatures, the Guardian Angel's 'monitoring component can take note of the number of conversations occurring in a room (and more specifically, a breakdown of the types of people in the room accompanied by a warning for dangerous persons, based on sex offender registration, FBI most wanted, etc.).' The versatile Guardian Angel, Microsoft notes, can also recommend restaurants, advise you on the appropriateness of your jokes, detect that your heartbeat has stopped, display targeted ads on billboards, and block spam."

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