Listening to music of a USB device
Files with DRM (Digital Rights Management) -Urheberschutz or from an online music store downloaded files can not be abgespielet on this system. If you try to play one of these files, the system plays the next unprotected file.
And so it is, alas! I do not understand as a layman. If I have purchased music online legally, I should be able to play with this unit. One star deduction!