Digital data transmission method and apparatus, digital data reproducing method and apparatus, digital data copy method and device, data recording medium, and storage method for storing digital data

摘要

Content in the content server is delivered to the user equipment. A distributor, wire network, cellular phone network and satellite network are used as the delivery means. The content is encrypted and compressed coded, and additional information including information of the accounting and accounting conditions is transmitted. The user apparatus performs the decoding of the cipher and the expansion of the compression coding, and the content is reproduced and the charging processing is performed at the time of reproduction. Content delivery is free and the reproduction is paid. The charging processing is performed using prepaid data. The prepaid data is expressed by the number of times of reproduction and the reproduction time. At the time of charge reproduction, the user equipment is authenticated by the authentication / charging server, and a key necessary for decoding is passed.