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Consider an identifier 𝐼𝑑 which appears several times in two datasets 𝐴 and 𝐡. After pseudonymisation, the identifier 𝐼𝑑 is substituted with respect to one of the following policies:

Deterministic Pseudonymisation

𝐼𝑑 is universally replaced by the same pseudonym π‘π‘ π‘’π‘’π‘‘π‘œ. It is consistent within a database and between different databases.

Document-randomised pseudonymisation

Each time 𝐼𝑑 appears in a database, it is substituted with a different pseudonym (π‘π‘ π‘’π‘’π‘‘π‘œ1, π‘π‘ π‘’π‘’π‘‘π‘œ2,...). However, 𝐼𝑑 is always mapped to the same collection of ( π‘π‘ π‘’π‘’π‘‘π‘œ1, π‘π‘ π‘’π‘’π‘‘π‘œ2) in the dataset 𝐴 and 𝐡.

Fully randomised pseudonymisation

For any occurrences of 𝐼𝑑 within database 𝐴 or 𝐡, 𝐼𝑑 is replaced by a different pseudonym (π‘π‘ π‘’π‘’π‘‘π‘œ1, π‘π‘ π‘’π‘’π‘‘π‘œ2,...).

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