Contents reproducing device

摘要

A license key provided for each element of contents data is stored in a key-only storing device provided separately from a contents storing device; the key-only storing device performs an authentication processing on a communicating partner, and, when authenticated, sends a license key corresponding to contents data to be reproduced to a reproducing device using an encrypted communication, whereby the reproducing device decodes the contents data to be reproduced using the license key and reproduces it.