iTunes Question

I don't have an iPod and rarely use iTunes, but occasionally get it into my head to buy some certain piece of music and don't want to go to a bricks-and-mortar store (gotta put on pants and all that).  So I'll buy stuff and burn them as CDs, and then maybe re-rip the MP3s if I want MP3s even though this is a bit lossy (and I know about the Hymn project but the last time I tried it, didn't work).

This past weekend I got a wild hair to buy 5 or so discs worth of tunes, and burned the first two quite successfully.  Subsequent ones I get an error telling me I don't have burning rights.

Now, in truth I have neither checked back on the itunes site nor elsewhere, but maybe a bored flister can clue me in quickly and save a bit of effort:  is there a class of track for purchase on Itunes that allows local (and presumably Ipod) usage but no burninating?

I'll be over here carving grooves in this giant slab of rock.
thanks
'vark