Even if the track is protected by Apple's DRM, if iTunes can play it then iiTunes can burn it to a CD (there's a limit on how many times). It will then be a normal audio CD, which you can rip on the B2 or on your computer. The quality will not be worse (nor better) than it is right now by being converted to WAV and burned to CD, so as long as you keep it as either WAV, or FLAC, or some other lossless format, it won't get any worse, either.