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This work discusses Ann Cavoukian’s fourth Privacy by Design (PbD) principle, which is known as Full Functionality – Positive-Sum, not Zero-Sum. The authors argue that this principle regulating trade-offs between privacy and functionality is questionable from a theoretic as well as from an operational point of view. A more consistent and pragmatic definition of positive-sum privacy is proposed and demonstrated using an example scenario in the context of video surveillance.