License ant the client

I have the license of a music track. What happened if my client makes bad use of the license and use the music illegally? What if he gets to separate just the plain music (out of the end product) through sophisticated software? Could I be punished for that? Why? I had done my side, not giving to him the item itself, but if he got it on a clandestine way, what can I do? Orientations, please.