Democracy may not be a sufficient condition for freedom, but it is a necessary condition for freedom. Depends on your definition of "democracy." I for one would contend that the ancient Greek system was just another form of oligarchy, and that there is no real democracy until you have universal adult suffrage. By that standard, there were no democracies until the 20th Century. There is nothing democratic about the Klingon system, and there's no evidence the Klingons have ever even claimed it to be democratic. A believer in Klingon feudalism would no doubt claim that democracy is illegitimate because political office should not be conferred upon a leader by his inferiors.