You can watch it here from Youtube; the movie is in German with English subtitles
Ps: I don't believe Karl committed suicide nor it was murder; I think he got away, this guy hacked into Nuclear Plant using a goddamn Commodore 64 and a modem of which the theoretical speed is only 2400 Baud/sec and he sold the info to KGB and bought a lot of drugs with the money. I mean apparently this guy is not stupid...the burnt body shit was probably a trick for him to start a new life IMHO.