Key information sharing system, delivery device and user terminal

A key information sharing system that allows key information to be shared, the system comprising:

• a server configured to deliver the key information;
• and
• a portable terminal configured to receive the key information delivered from the server,
• wherein the key information is associated with an object equipped with a control device, the control device performing a predetermined control to the object when the control device receives the key information from an external terminal,
• wherein the key information includes restriction information, the restriction information setting a restriction content for the predetermined control,
• wherein the server is configured to add transfer information to the key information, the transfer information permitting a transfer of the key information from the portable terminal to the external terminal,
• wherein the server is further configured to add sharer restriction information to the key information when the transfer information is added to the key information, the sharer restriction information being information that allows the key information to be transferred only between the portable terminal and a particular external terminal belonging to a particular group, and
• wherein, when the portable terminal receives the key information to which the transfer information and the sharer restriction information have been added, the portable terminal transmits the key information to only the particular external terminal.

A non-transitory computer readable medium having instructions stored therein, which when executed by a processor in a server cause the processor to implement a method of sharing key information to a portable terminal, the method comprising:

• delivering the key information to the portable terminal,
• wherein the key information is associated with an object equipped with a control device, the control device performing a predetermined control to the object when the control device receives the key information from an external terminal,
• wherein the key information includes restriction information, the restriction information setting a restriction content for the predetermined control,
• wherein the method further comprises:
• adding transfer information to the key information, the transfer information permitting a transfer of the key information from the portable terminal to the external terminal, and
• adding sharer restriction information to the key information when the transfer information is added to the key information, the sharer restriction information being information that allows the key information to be transferred only between the portable terminal and a particular external terminal belonging to a particular group, and
• wherein, when the portable terminal receives the key information to which the transfer information and the sharer restriction information have been added, the portable terminal transmits the key information to only the particular external terminal.