Alcas Music Master Copy Protection

Hi there,

a friend has a Bar with a Alcas Music Master PC- based MP3 Player.
He gets monthly update CD’s with .mp3 files on it and two other files.
I want to copy the musik to my pc but the files are not working.
I thing there is a copy protection/encryption on the mp3 files.
They wont play. Can anybody help me with this?
There must be a solution to decrypt the “mp3” files to normal mp3 files.