de-authorize

I have several machines and have also reinstalled Windows more than once on most WIndows machines. I also have a MacBook, but my daughter uses it under her account with her iTunes.

Anyway, I have no idea which machines are authorized and suspect that (as I have reached a total of 5), I may have more than one authorization on only one machine and maybe also some on machine that have already been scrapped/reformated etc.

The easy answer is to de-authorize all, but apparently I did that in 2/2011 so will only be allowed to do it again in 2/2012.

I find that iTunes seems to be in the business of stopping me listening to my music. I have bought nothing from the iTunes store; I buy CDs and rip them and sometimes even rip one belonging to a son, daughter or friend (or even made BY my son). And I buy them elsewhere. So anyway, there's no DRM music on my machines so this whole authorization thing seems only to be a way to get in the way of my music pleasure.

So, how to find out WHICH machines are authorized. (Apple apparently knows, so why can't I know too?)

Basically I dislike iTunes intensely (the interface *****), but I do need it e.g. for DJ and Remote for my music library (though an iPod/iPad/iPhone and Airport).