Telecommunications apparatus and method, storage medium, and program

A data transmitting method, implemented on data transmitting apparatus, comprising:

• generating packet data including a random number that is different from random numbers transmitted in other packet data;
• transmitting, via a first network, said packet data to a data receiving apparatus;
• receiving a response message from said data receiving apparatus, said response message including first information generated by said receiving apparatus based on a shared secret key shared with said data receiving apparatus;
• computing second information based on said shared secret key;
• comparing said first information and said second information;
• measuring a response time of said response message from said data receiving apparatus;
• judging whether content data transmitted to said data receiving apparatus will be limited in usage right based on a result of said comparing and a result of said measuring;
• determining whether said data transmitting apparatus and said data receiving apparatus are connected through a Wide Area Network (WAN) based on a result of said judging, and
• limiting in usage right the content transmitted to said data receiving apparatus when said determining determines that said data transmitting apparatus and said data receiving apparatus are connected through said WAN.

A non-transitory computer readable storage medium encoded with computer program instructions which cause a computer to execute a method of controlling a data transmission apparatus, comprising:

• generating packet data including a random number that is different from random numbers transmitted in other packet data;
• transmitting, via a first network, said packet data to a data receiving apparatus;
• receiving a response message from said data receiving apparatus, said response message including first information generated by said receiving apparatus based on a shared secret key shared with said data receiving apparatus;
• computing second information based on said shared secret key;
• comparing said first information and said second information;
• measuring a response time of said response message from said data receiving apparatus;
• judging whether content data transmitted to said data receiving apparatus will be limited in usage right based on a results of said comparing and a result of said measuring;
• determining whether said data transmitting apparatus and said data receiving apparatus are connected through a Wide Area Network (WAN) based on a result of said judging, and
• limiting in usage right the content transmitted to said data receiving apparatus when said determining determines that said data transmitting apparatus and said data receiving apparatus are connected through said WAN.

A data transmitting apparatus comprising:

• means for generating packet data including a random number that is different from random numbers transmitted in other packet data;
• means for transmitting, via a first network, said packet data to a data receiving apparatus;
• means for receiving a response message from said data receiving apparatus, said response message including first information generated by said receiving apparatus based on a shared secret key shared with said data receiving apparatus;
• means for computing second information based on said shared secret key;
• means for comparing said first information and said second information;
• means for measuring a response time of said response message from said data receiving apparatus;
• and
• means for judging whether content data transmitted to said data receiving apparatus will be limited in usage right based on a result of said comparing by said means for comparing and a result of said measuring by said means for determining;
• means for determining whether said data transmitting apparatus and said data receiving apparatus are connected through a Wide Area Network (WAN) based on a result of said judging by said means for judging, and
• means for limiting in usage right the content transmitted to said data receiving apparatus when said means for determining determines that said data transmitting apparatus and said data receiving apparatus are connected through said WAN.

A data receiving apparatus comprising:

• a communication interface configured to receive, from a data transmitting apparatus, packet data including a random number that is different from random numbers in other packet data transmitted by the data transmitting apparatus;
• a processor configured to generate first information based on a shared secret key shared with said data transmitting apparatus;
• and
• said communication interface configured to transmit a response message including said first information to said data transmitting apparatus, wherein
• said data transmitting apparatus judges whether content data transmitted to said data receiving apparatus will be limited in usage right based on a result of said comparison between said first information and second information generated at said data transmitting apparatus based on said shared secret key, and a response time of said response message received from said data receiving apparatus, and said data transmitting apparatus determines whether said data transmitting apparatus and said data receiving apparatus are connected through a Wide Area Network (WAN) based on a result of said judging and limits in usage right the content transmitted to said data receiving apparatus when said determining determines that said data transmitting apparatus and said data receiving apparatus are connected through said WAN.