Reply to laptop surcharge to play sets

http://www.mixmag.net/words/news/gem...rge-to-dj-sets

I'm really trying hard to wrap my head around the fees Germany is trying to enforce in the evening clubs. Can someone closer to the source give me an idea of why the form of media being played changes the royalties? I'm kind of baffled at what has been happening this year with rights management and club fees. I'm even more confused is if this applies to artists using the computer to perform a live set from stems they produced or just DJ sets?