Sorry, I just forgot about Oracle policy terms. Yes, you are right and I am wrong.
Best Hans > Short Answer: Because of Oracle. > > Longer Answer: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=794466 > > Summary: Virtualbox will at the current state of affairs never be in > Testing or any stable release or stable-backports ever again. > > Grüße, > Sven.