zephyrus

Hi everyone, I recently got from a friend an rather old Md player the MZ-NE410 model. I tried to use sonicstage to put my MP3's on it and the the program did not allow the files to be transferred, some copyright problem. What can I do!? I really want to use this player, is there another porgram that I can use or is there some way to overcome this sonicstage problem? thanks