Sports broadcasting e.g. olymic games are blocked in the same way, from juridical reasons it is not possible to show this ... even if there is a short story about such issues in "Tagesschau" it is blocked. No way... This makes sence especially in that cases ARD or ZDF provides a stream in internet, it is blocked abroad as well...
I don't know which rights maybe concerned, but I'm sure that there are juridical reasons.