Our understanding is that you will be issued a different license depending one where you buy the game (by IP address). Basically, if the game is sold to someone we know is in Germany, we/Steam need to abide by USK's rules. If you live (IP) outside Germany, we/Steam will sell you a non-German/USK version.
Well with Killing Floor for example i gifted my GF a Copy over Steam and she ended up having the cut version. (both of us live in Germany). I ordered another Copy from amazon.uk and got it registered in place of the Steam Version and then she could play uncut.
Could you shed some light if this will also work with RO2 ? It would be appreciated.