It depends on the agreement when he was hired and

company's rule. As consultant, he might even be allowed work at home, so brought codes home may/may not be violation. In 李文和 case, he broke the law because the lab doesn't allow to bring the code to home computer although in practice many people work there did brought something home. Similar case related to CIA director's mistress who brought files home, violated the law because her clearence only allows her read these files at office