How do I batch delete all my protected music files from iTunes.

Hi, in a moment of stupidity, while I was working on a backup folder of my friends files (from his broken computer - copied them to my PC so he could get them back onto his new PC) I managed to copy all of his songs from his iTunes folder into my iTunes library. I don't know how I managed to do this, maybe it was the fact that I was really tired at the time.

I own all my music - none of my music is copy protected (it is either downloaded from legal sites where the bands themselves [usually unknown or alternative artists] release their music, or I ripped the music from CD's I bought) and all of his music is copy protected.

Now thing is, I have upgraded my PC before realising I did this, so now I don't have the original iTunes library (formatted PC and reinstalled XP from scratch) - is there any tools out there that will find and delete all your copy protected files from iTunes?

I could go through song by song and when it comes up with the "Authorise computer - This computer is not authorised to play " ******" Would you like to authorise it" and delete those songs, but as this is a very slow and time consuming process and considering I have 8,551 songs, I would prefer a faster way.

I would go and re-rip all the songs, as I have the original discs, but this would take very long, and put quite a bit of strain on my CD drive, and this would not account for all the songs I have spent years finding on the internet/demo songs from friends bands.

Any help is appreciated, as I would love to be able to remove all of his songs so they don't keep popping up in my iTunes library 🙂

Thanks in advance.

Dale.