It is probably not a packet shaper if it is blocking Kazaa entirely. AFAIK, packet shapers are typically only used to throttle connections on certain services down to a point where they might as well be useless. I could be wrong, though.
If it's blocked entirely, though, I'd suspect they're just blocking port 1214 at the border router. Or they may have a stateful firewall in place that inspects the packets for content as well as headers and blocks on the basis of that.
If they're not using a stateful firewall, it may be possible to tell Kazaa to connect on a different port or something (though I don't know, since I haven't used it in a while), or you could try other filesharing programs like WinMX, Shareaza, or SoulSeek. It wouldn't surprise me if those are also banned, though.
Keep in mind that your school probably banned them for a reason (probably bandwidth concerns as well as copyright concerns). Trying to circumvent that ban is probably a violation of their AUP -- for that matter, using filesharing in the first place is probably a violation of their AUP. But if you absolutely can't live without your ju4r3z & mp3z and don't care if your port gets shut off, you can always get it like they did back in the dark ages and use IRC -- that's probably not blocked.
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