Patent ID: 8074290

Claim:
A content transfer system for transferring content between a source device transmitting the content and a sink device receiving the content, comprising: a processor; a content specifying unit for specifying the content to be transferred between the source device and the sink device; an authentication unit for performing an authentication exchange key process between the source device and the sink device; a content transfer unit for performing a content transfer process by encrypting and transferring the content specified by the content specifying unit from the source device to the sink device using a key exchanged by the authentication unit; a content transfer finalizing unit for performing a content transfer finalizing process by validating the content at the sink device and invalidating the specified content at the source device in response to the end of the content transfer process performed by the content transfer unit, the content thus being moved from the source device to the sink device; and a content transfer finalizing process resuming unit for using the processor to resume the content transfer finalizing process when the process performed by the content transfer finalizing-unit is interrupted, wherein: the content transfer finalizing process resuming unit shifts a state of the specified content at the source device to an interim invalid state, the interim invalid state indicating that the specified content is temporarily unusable by the source device; and the content transfer finalizing process resuming unit resumes the content transfer finalizing process regardless of a successful ending of the content transfer process performed by the content transfer unit to encrypt and transfer specified content from the source device to the sink device by using the exchanged key.