It depends on whether or not the company you work for has treated you with dignity and fairness.I would be sure and make notes of the serial #s of the machines it's installed on, then keep those notes in a safe place at home.
If your company decides to lay you off (fire you) I would casually bring up the fact that you know all about the illegal software installed on the company computers.
It can't hurt to apply a little equalization.Kinda like the guy in "American Beauty".