How do you get downloaded iMesh songs onto a Zune?

I downlaoded the iMesh software and for some reason, I can't add songs onto my zune software. I tried converting the file type but it said that the files were protected by DRM (Digital Rights Management). I don't get it, if I 'm not supposed to convert music files from iMesh and put it in my Zune, why did they allow me to download it to my computer? Is there a way to get it on my Zune? Help? =)