Purpose limitation: Under GDPR, which principle most directly | AIGP
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Purpose limitation: Under GDPR, which principle most directly governs whether this new use is permitted?

AIGP Understanding How Laws, Standards and Frameworks Apply to AI Medium

Reusing data collected for one purpose to train an AI model raises purpose limitation and its compatibility test.

The question

A retailer collected customer contact details to fulfill orders. It now wants to reuse that same personal data to train a marketing-propensity AI model. Under GDPR, which principle most directly governs whether this new use is permitted?

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  1. Storage limitation, requiring that personal data be kept no longer than strictly necessary for its stated purposes
    Plausible but wrong: storage limitation concerns retention duration, not repurposing already-held data.
  2. Data minimization, requiring that only personal data adequate and necessary for the purpose be processed
    Related, but minimization limits the volume of data, not whether a new purpose is compatible.
  3. Accuracy, requiring that personal data be kept correct and, where necessary, updated over its lifecycle
    A real principle, but accuracy addresses data correctness, not the legitimacy of a secondary purpose.
  4. Purpose limitation, requiring the new AI use to be compatible with the original order-fulfillment purpose ✓
    Correct: reusing data for a new purpose triggers the purpose-limitation compatibility question.
The trap
Reaching for data minimization whenever AI training uses personal data, instead of the purpose-compatibility issue.

How to remember it

Reusing data collected for one purpose to train an AI model raises purpose limitation and its compatibility test.

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