Information provision system, content information copying device, user terminal device and user management device

摘要

A content encryption device (11) generates encrypted content and an encrypted content copying device (16) copies the encrypted content on an information storage medium (18). The storage medium (18) is sold at a charge or distributed at no charge. A user gets the storage medium (18) to connect or set it to or in a user terminal device (17), accesses to a content key distribution device (14) to present a part or a whole of medium information of the storage medium (18) to the distribution device (14). The distribution device (14) grasps the whole of the medium information of the copied medium (18) together with copied content and makes a content key encryption device (12) issue an encrypted content key on the basis of user presentation information and distributes it to the terminal device (17).