Information processing apparatus, information processing system, information processing method, storage medium and program

An information processing apparatus connectable to a network comprising:

• receiving means for receiving data via said network;
• extracting means for extracting identification information for uniquely identifying said data from said data;
• transmitting means for transmitting said identification information to a data managing device on said network;
• signature data acquiring means for acquiring signature data corresponding to said data from said data managing device;
• and
• verifying means for verifying said data using said signature data.

An information processing apparatus connectable to a network comprising:

• first receiving means for receiving identification information intended to uniquely identify data and signature data of said data from a first external information processing apparatus via said network;
• managing means for managing said identification information and said signature data in a manner that they correspond;
• second receiving means for receiving said identification information from a second external information processing apparatus via said network;
• and
• transmitting means for transmitting signature data managed by said managing means and corresponding to said identification information to said second external information processing apparatus,
• wherein said identification information is added to said data to be distributed from said first external information processing apparatus to said second external information processing apparatus via said network.

An information processing method comprising the steps of:

• generating signature data of data;
• acquiring identification information for uniquely identifying said data;
• and
• outputting said signature data and said identification information onto said network.

An information processing method comprising the steps of:

• receiving data via a network;
• extracting identification information for uniquely identifying said data from said data;
• transmitting said identification information to a data managing device on said network;
• acquiring signature data corresponding to said data from said data managing device;
• and
• verifying said data using said signature data.

An information processing method comprising the steps of:

• receiving identification information intended to uniquely identify data and signature data of said data from a first external information processing apparatus via said network;
• managing said identification information and said signature data in a manner that they correspond;
• receiving said identification information from a second external information processing apparatus via said network;
• and
• transmitting signature data corresponding to said identification information to said second external information processing apparatus,
• wherein said identification information is added to said data to be distributed from said first external information processing apparatus to said second external information processing apparatus via said network.

A program for a computer to implement an information processing method comprising the steps of:

• generating signature data of data;
• acquiring identification information for uniquely identifying said data;
• and
• outputting said signature data and said identification information onto a network.

A program for a computer to implement an information processing method comprising the steps of:

• receiving data via a network;
• extracting identification information for uniquely identifying said data from said data;
• transmitting said identification information to a data managing device on said network;
• acquiring signature data corresponding to said data from said data managing device;
• and
• verifying said data using said signature data.

A program for a computer to implement an information processing method comprising the steps of:

• receiving identification information intended to uniquely identify data and signature data of said data from a first external information processing apparatus via said network;
• managing said identification information and said signature data in a manner that they correspond;
• receiving said identification information from a second external information processing apparatus via said network;
• and
• transmitting signature data corresponding to said identification information to said second external information processing apparatus,
• wherein said identification information is added to said data to be distributed from said first external information processing apparatus to said second external information processing apparatus via said network.

A storage medium storing in a computer-readable manner a program for a computer to implement an information processing method comprising the steps of:

• generating signature data of data;
• acquiring identification information for uniquely identifying said data;
• and
• outputting said signature data and said identification information onto a network.

A storage medium storing in a computer-readable manner a program for a computer to implement an information processing method comprising the steps of:

• receiving data via a network;
• extracting identification information for uniquely identifying said data from said data;
• transmitting said identification information to a data managing device on said network;
• acquiring signature data corresponding to said data from said data managing device;
• and
• verifying said data using said signature data.

A storage medium storing in a computer-readable manner a program for a computer to implement an information processing method comprising the steps of:

• receiving identification information intended to uniquely identify data and signature data of said data from a first external information processing apparatus via said network;
• managing said identification information and said signature data in a manner that they correspond;
• receiving said identification information from a second external information processing apparatus via said network;
• and
• transmitting signature data corresponding to said identification information to said second external information processing apparatus,
• wherein said identification information is added to said data to be distributed from said first external information processing apparatus to said second external information processing apparatus via said network.