1# Application Access Control Subsystem Changelog
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3## cl.sucurity_access_token.1 Changes in the Event Subscription and Cancellation APIs
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5**Change Impact**
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7The applications developed based on earlier versions are not affected.
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9**Key API/Component Changes**
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11Involved APIs:
12interface/sdk-js/api/@ohos.abilityAccessCtrl.d.ts:
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14atManager.on
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16atManager.off
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18From this version:
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20Multiple callbacks can be registered if **tokenIDList** and **permissionList** are the same.
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22The same callback cannot be registered if **tokenIDList** or **permissionList** are overlapped.
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24If callback is not passed in **atManager.off**, all callbacks under **tokenIDList** and **permissionList** will be unregistered.
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