berlin court western german city muenster sentenced computer technician year prison sexually pervert children cases german news agency dpa reported severity crime man prison term extended years court man whose identity released customary germany said main delinquent group people involved intimate illtreat perpetrators used sophisticated applied science encrypt communication vilification children law secured c terabytes video recording footage arrested men muenster last men convicted man hannover received prison sentence sexual abuse children four cases man schorfheide sentenced years six months prison fivespot cases abuse man staufenberg sentenced years prison six cases dpa report threesome sentences also extended end prison terms severity mother computer technician sentenced five years prison complicity sentences still appealed dpa report