The fifth amendment applies to both criminal and civil cases, if the testimony could be used in a criminal prosecution. The judge has already referred this for

The fifth amendment applies to both criminal and civil cases, if the testimony could be used in a criminal prosecution. The judge has already referred this for criminal prosecution, so Levandowski's apprehension about self-incrimination is certainly warranted. If the files only exist on Levandowski's personal machine(s), then Uber can't comply with the court order without Levandowski incriminating himself.