| 摘要 |
In the case of a BD or the like, when encryption information used for copyright protection is updated, the version number of defective encryption information is stored into an area of a commercial medium other than the content recording area, and the user is prompted to update to a newer version number. According to an embodiment of the present invention, the version number of encryption information on the device being used can be checked easily by the user by means of an external command. If this is a defect information version number, playback is not performed, and a display that prompts updating of the encryption information is made as required.
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