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Reviving Purpose Limitation and Data Minimisation in Personalisation, Profiling and Decision-Making Systems

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Finck,  Michele
MPI for Innovation and Competition, Max Planck Society;

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Citation

Biega, Asia, & Finck, M. (2021). Reviving Purpose Limitation and Data Minimisation in Personalisation, Profiling and Decision-Making Systems. Max Planck Institute for Innovation & Competition Research Paper, No. 21-04.


Cite as: http://hdl.handle.net/21.11116/0000-0007-AA82-6
Abstract
This paper determines, through an interdisciplinary law and computer science lens, whether data minimisation and purpose limitation can be meaningfully implemented in data-driven algorithmic systems, including personalisation, profiling and decision-making systems. Our analysis reveals that the two legal principles continue to play an important role in mitigating the risks of personal data processing, allowing us to rebut claims that they have become obsolete. The paper goes beyond this finding, however. We highlight that even though these principles are important safeguards in the systems under consideration, there are important limits to their practical implementation, namely, (i) the difficulties of measuring law and the resulting open computational research questions as well as a lack of concrete guidelines for practitioners; (ii) the unacknowledged trade-offs between various GDPR principles, notably between data minimisation on the one hand and accuracy or fairness on the other; (iii) the lack of practical means of removing personal data from trained models in order to ensure legal compliance; and (iv) the insufficient enforcement of data protection law.