The Data Scientist shall not apply any technique (combination, enriching, etc) to turn information that has been designed to be “de-identifiable” into “identifiable” again.
It would also compromise the GDPR. Most of the times, data scientists are not even aware of doing that, as combining data sources is an essential part of the data preparation phase. Several attributes purposely held in different data sources can lead back to an individual person when combined.
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