Removing DRM from tracks breaks iTunes ringtones

We haven't seen this covered anywhere yet so we thought we'd throw up a warning to those who like to remove iTunes' DRM using the perfectly legal and allowed method of burning a song to CD and then re-ripping it to your iTunes library. It turns out that if you do this you will no longer be able to create a ringtone out of the song, instead you get the error you see to the right. We're not big fans of charging people to use music they already own as a ringtone, and we're really not fans of Apple keeping you from moving your own ringtones onto the iPhone, but taking away your ability to pay for a ringtone just because you removed the DRM is just plain mean.