The thing making you think the DRM wokrs is that the software you are using to convert WMA to mp3 doesnt work. Fair enough.

BUT :

1) You want to transfer your music from your PC to your mp3 player. Hopefully it should work (otherwise, why purchase digital music?).

2) You want to play your file on another PC or mp3 player. Hopefully you can (otherwise, why purchase digital music? a legally bought CD can be played in every CD player on the earth).

So either these two points do not work and then this new format is totally unusable, otherwise it means these files can be exchanged and playe do,n every PC / mp3 player on the earth so i dont really see how can illegal copies could be avoided.