In an interview with weekly magazine Der Spiegel Sabine Leutheusser-Schnarrenberger said she was concerned the firm was accruing too much power and information about citizens via programs like Google Earth and Google Books.
"All in all, what's taking shape there to a large extent is a giant monopoly, similar to Microsoft," the minister said.
"My initial response is not to ban something or stop something. But I do want to create more transparency and ensure that users know what is going on with their data," she added.
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