Digital information storage system and digital information delivery system

摘要

A digital information storage system(60) has a storage (62). A user bought the digital information from a server(40) built on a network(1) by using a user device(20) and possesses it in the storage(62). The system(60) has a host-function device(68) as well. The host-function device(68) operates based on a command coming from the user device(20) through the network(1) and duplicate conditions of the stored digital information. The host-function device(20) enables not only the delivery (output) of the storage-stored digital information to the user device(20) via the network(1) but also the return (input) of the digital information from the user device(20) to the storage via the network(1).