Don't ask me why.

It was not just "indiziert" which means that it could be sold on special shops with an area just for adult movies, where no minors are even allowed to enter. It was "beschlagnahmt" which means that it wasn't allowed to publish, and copies were confiscated by police.

"Indiziert" is for movies, songs, comics called 'jugendgefährdend' which means that judges thoght the movies where bad for the development of youth regarding violence, sex or such things.

"Beschlagnahmt" is for movies, songs, comics which are judged to be someway against some law against glorifing violence. It is not forbidden to own them private, but to sell them, rent them, publicy them.