Explicit permissions for each user to improve the system's security.

每个用户的权限明确，提高了系统的安全性。

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This allows the private end-use rights which ODRL makes more explicit in its Usage entity of Play, Display, Execute, and Print permissions.

这提供了用于个人用途的最终使用权限，ODRL 使其播放、展示、执行和打印权限的使用更加明确。

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To prevent these implied forbidden permissions from being authorized to the user later and to reinforce RBAC s security, it is necessary to introduce explicit negative authorization in RBAC.

为了防止被隐含禁止的权限将来授权给用户，增强RBAC的安全性，引入显式的负授权是有必要的。

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