Convert m4p to mp3 — Music MP3 — DVD MP3 AVI MP4 players codecs conversion help

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I have a number of m4p's that I bought but it was under my ex-wife's
account, when I re-imaged my machine and placed them back on my drive,
it required reauthorization. I need her account information to
authorize (which she has changed). Is there anyway to remove the DRM
and convert without this authorization?
Thanks