FREE drm removal for wma for mac or pc no trials?

I need an absolutely free drm removal tool for mac or pc. I've already bought all my music but I want to use it on a different device and this drm stuff doesn't let me. I've tried like myfairtunes and qtfairuse and all these other free ones but they don't work. The only ones I can find that work are the demos for the converters that cost $30 and up!! I already bought all my music why should I have to pay another $30?!? Does anybody know of an absolutely free one?? Please?