https://www.reuters.com/article/us-uber-alphabet-lawsuit/uber-waymo-clash-over-key-evidence-in-self-driving-trial-idUSKCN1BP2RB >Uber has asked a U.S. judge to exclude evidence from an upcoming trade-secrets trial about how a former engineer downloaded thousands of confidential files from Alphabet Inc's Waymo self-driving car unit before eventually joining Uber.