A central New York man was sentenced Thursday for installing hidden cameras in his tenants' apartments so he could spy on them while they had sex.

Patrick Kaiser, 49, of Oneida, was sentenced to two to six years in state prison. He was convicted in December of four felony counts of unlawful surveillance.

He was sentenced in Madison County Court, Kaiser told the judge he was sorry for installing cameras in an apartment so he could spy on his tenants while they had sex.
http://news.yahoo.com/s/ap/20070302/ap_on_fe_st/landlord_spying

Semitic Hebrew also uses the same word ("Keisar", Heb. קיסר) , though in this case the term did not go through German but came directly from Latin in the Roman period itself.
http://en.wikipedia.org/wiki/Kaiser