| 摘要 |
There is provided a data distribution system which prevents unauthorized copying while permitting copying for private use. To a server 100, a home server 200 transmits identification data identifying a user and/or a device with respect to which/whom playback permission of copyrighted-material data is requested, and requests transmission of a desired piece of copyrighted-material data. The server 100 transmits the copyrighted-material data to a home server 200, with the identification data being appended to the desired piece of copyrighted-material data. The home server 200 receives the copyrighted-material data from the server 100. Based on the identification data appended to the copyrighted-material data, the home server 200 determines whether or not playback is permitted with respect to a user and/or a device that is attempting to play back copyrighted-material data, and plays the back copyrighted-material data if playback is permitted.
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