| 摘要 |
When a user domain is to be segmented or a plurality of user domains are to be grouped, user domain management information before segmentation or grouping is inherited and stored as old-generation user domain management information. In addition, the domain generation of each of user domains after segmentation or grouping is updated to generate a domain key for the new generation. Furthermore, a list of terminals as domain members of the new-generation user domain, a list of rights objects as sharing targets, and a list of rights object excluded from the rights objects as sharing targets are generated. The generated new-generation domain key, the list of domain members, the list of rights objects as sharing targets, and the rights object invalidation list are additionally stored as new-generation user domain management information.
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