[FroshKiller]

I'm not a lawyer, and this is the sort of thing that could vary among jurisdictions, but whether they'll know is probably irrelevant. What will matter is whether they can prove it to the satisfaction of the court if they take action. Your employer doesn't need to know you did something--they just need to present it as likely that you did to a greater degree than you, with fewer resources, can prove you did not. This is the kind of thing that would generally be a civil matter, not criminal, and so the standards of criminal prosecution wouldn't apply (e.g. no presumption of innocence).

Never mind the questions of ethics and professionalism. From a legal perspective, it just doesn't seem worth the risk. The deck is stacked against you, and it doesn't matter what you think of the rules of the game.