Mitstörerhaftung ("co-disturber liability") in German law means that if you enable someone being a disturbance then you might get slapped too. In relation to W

Mitstörerhaftung ("co-disturber liability") in German law means that if you enable someone being a disturbance then you might get slapped too. In relation to Wifi, this so far meant that if someone torrented a movie or uploaded music without license over your wifi, you'll get a free court visit too and possibly a fine. That made operating an open and free wifi hotspot a legally fairly risky problem (lots of free wifi here still has very aggressive content filtering). The law responsible was discontinued in october last year. This has been recently confirmed by the BGH (some high court in germany, the case was from before the law was ended but the changed law was taken into consideration), though you're not entirely off; the court can rule that you need to install a site filter and prevent torrenting or even put up a password on your wifi if there is too much disturbance caused by activity on your hotspot.