Alphabet’s Waymo, previously known as Google’s self-driving car unit, is stepping up its legal attack on rival Uber Technologies, asking a court to block Uber from using Waymo technology against it in the race to develop self-driving cars.

The request for a temporary injunction, filed Friday in a federal court in San Francisco, is part of an amended complaint against Uber and its Otto autonomous driving unit, which is accused of stealing Waymo trade secrets related to a crucial technology that lets driverless cars “see” what’s around them.

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Forbes’ Alan Ohnsman asked Lisa Larrimore Ouellette, a Stanford Law School professor who specializes in intellectual property law, whether Levandowski’s comments could be problematic for Uber as it seeks to defend itself in court.