ELECTRONIC MONEY SYSTEM

摘要

A content data reproducing method and an electronic money or electronic license, wherein the security of the electronic money or electronic license is checked when compressed and/or encrypted content data is reproduced, if the electronic money or electronic license is invalid as a result of the check, the reproduction of the content data is stopped, if the electronic money and electronic license are valid, the content data is reproduced and the electronic money or electronic license is consumed.