Audio, mp3 lisence question

not really a unity related question but hey lets ask it since unity doesn't play mp3.

i am writing a jukebox that uses wwwclass to play audio from hd, and since mp3 is not supported here, i thought i'd write a console application that runs on background if next song is mp3, and converts the mp3 to wav and plays the wav file, to my question now,

is there any legal issues that prevent this? i dont really know where else to ask this.