Section 172

For the purposes of section 171, in relation to a person who re-identifies information that is de-identified personal data, “the effectiveness testing conditions” means the conditions in subsections (2) and (3). The first condition is that the person acted— with a view to testing the effectiveness of the de-identification of personal data, without intending to cause, or threaten to cause, damage or distress to a person, and in the reasonable belief that, in the particular circumstances, re-identifying the information was justified as being in the public interest. The second condition is that the person notified the Commissioner or the controller responsible for de-identifying the personal data about the re-identification— without undue delay, and where feasible, not later than 72 hours after becoming aware of it. Where there is more than one controller responsible for de-identifying personal data, the requirement in subsection (3) is satisfied if one or more of them is notified.

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Source: legislation.gov.uk · retrieved 2026-09-04