no...the difference is:
that's bittorrent, you use a server, and you have your clients help share the file, only shares the server's file that was shared.
remove the server. then that's kazaa/others, share ANYTHING on YOUR Computer. then you get the illegal things.
sometimes people put illegal things on servers and bittorrent them, but that's another story.
kazaa is a network.
bitorrent is server-client-client