Bob is allowed access to the downloads area, but because he isn't the admin or root user, he is forbidden access to the security directory.
允许Bob访问下载区域，但是由于他不是管理员用户或者根用户，所以禁止他访问安全目录。
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。
The supplier of sites or facilities, on discovering any user involved in illegal acts, shall report to the relevant authorities. Any connivance or shielding is forbidden.
场地、设施的提供者发现使用者有违法行为的，应当向有关部门举报，不得纵容、庇护。
The supplier of sites or facilities, on discovering any user involved in illegal acts, shall report to the relevant authorities. Any connivance or shielding is forbidden.
场地、设施的提供者发现使用者有违法行为的，应当向有关部门举报，不得纵容、庇护。
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