To provide a conditional reception system which can prevent unauthorized relocation of a receiver between CATV stations and promote subscription of a recipient to a CATV station in an area to which the receiver is relocated. 受信機のCATV局間での無断移設を防止し、受信者の移設先CATV局への加入を促進することが可能な限定受信システムを提供する。 - 特許庁