Why did itunes download as MP4 protected files when I setup MP3
I have setup my itunes to download files as MP3 when I buy them (and I have checked - this is still current). However when I bought half a dozen songs they have downloaded as protected MP4 files, and so won't convert to MP3 files. i have downloaded them for my daughter's MP3 player, and so they won't work! Is there anything I can do to convert them? And is there anyway of stopping this happening in the future?
dell, Windows XP