I think MP10 will play it if its DRM protected.

Only reason i say this is that I downloaded some track's from Tesco (5 free with an MP3 player I bought) and it wouldnt run on MP9. I downloaded 10, it downloaded the licence and played.

Copied it across via USB pen and played on my other machine, already running MP10, and it worked also.

I then checked the properties of the song and it said I had one more transfer available.