Patent ID: 8589970

Claim:
A content transmitter apparatus to deliver content to a content receiver apparatus through a network, comprising: a portion authentication processing portion configured to authenticate the content receiver apparatus and create key information to be shared with the content receiver apparatus; an encryption processing portion configured to encrypt the content to be delivered to the content receiver apparatus by using the key information; a communication processing portion configured to transmit and receive authentication data to and from the content receiver apparatus and transmit the content to the content receiver apparatus via the network; and a controller to control the portion authentication processing portion, the encryption processing portion and the communication processing portion; wherein the controller authenticates, through the portion authentication processing portion, the content receiver apparatus according to a first authentication method and registers portion information of the authenticated content receiver apparatus; wherein, when the content encrypted by the encryption processing portion is delivered through the communication processing portion to the content receiver apparatus located outside a house, the controller authenticates the content receiver apparatus located outside the house according to a second authentication method and transmits the remote exchange key information, the second authentication method including a procedure that authenticates the content receiver apparatus when it is decided that an authentication according to the first authentication method is performed to the content receiver apparatus and the portion information of the content receiver apparatus is registered; wherein, when the content encrypted by the encryption processing portion is delivered through the communication processing portion to the content receiver apparatus located inside the house, the controller authenticates the content receiver apparatus according to a third authentication method and transmits in-house exchange key information different from the remote exchange key information.