The Digital Markets Act requires designated search engine gatekeepers to provide competing search engines with access to anonymous ranking, query, click, and view data. Google's approach to anonymization, however, has addressed these privacy concerns by severely diminishing the utility of shared data, effectively undermining Article 6(11) of the DMA. This workshop presents a counter-anonymization methodology, designed by Paul Francis (Director Emeritus, MPI-SWS) in collaboration with Andreas Dewes (Privacy Engineer, DuckDuckGo) that maintains strong anonymity guarantees while preserving significantly greater data utility. Projections were validated using DuckDuckGo search data samples. This workshop will demonstrate that strong anonymization guarantees and meaningful data utility are not mutually exclusive — and will situate this analysis within the draft EC/EDPB guidelines on the interplay between data protection and digital market contestability under the DMA and GDPR.

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