How to get around iTunes' copy limits:
1. Burn a cd. iTunes will let you burn 6 CDs with purchased music. This is inconsequential, since digital recordings don't degrade like analog recordings do. I'm not saying they don't degrade at all, but it's much less noticable. Don't forget to burn it as MUSIC and not as DATA.
2. Delete the purchased songs from your machine. Empty the trash/recycle bin.
3. Import the songs from the CD to iTunes. As far as iTunes knws, you bought the CD somewhere else, and it might just be a random disc if it can't find CDDB data on it. At any rate, iTunes could care less how many copies of your on stuff you make, so long as they weren't bought in the iTunes store. But, as I pointed out above, the tag the put in the file to signify a purchased track is lost when you record a music CD since most CD players are confused by extra crap in the file.
Come on, not that hard y'all.