I have some (paid for) DRM music files in wma but I need them in mp3 format. Which software should do it?

I used a tunegenie service to get some songs for $0.99 but they came in .wma format. I need them in .mp3 format to use on my phone mp3 player but the software I have tried in the past can't open the file due to the DRM. Is there a way to get around this?