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purpose limitation

/ˈpɜːrpəs ˌlɪmɪˈteɪʃən/ - n.

1 [colloq.] The requirement that the stated purpose be broad enough to cover any future purpose nobody has thought of yet.Keep. Punchy.This is the problem.

Working definition

2. The requirement that data collected for one purpose not be reused for an incompatible one without a fresh basis.

Evidence

See also

consentA freely given, specific, informed agreement obtained through a banner engineered so that 'Accept All' is the only restful option.
data minimizationThe principle that lost, by unanimous vote, to a roadmap item called 'data we might need to train on later.'
lawful basisThe ground selected after processing begins, by choosing whichever one the activity already happens to fit.