Details

ClearPermissions[…,{class₁,class₂,…}] clears permissions for all classes class_i.
ClearPermissions[class] effectively removes any explicit permission specifications for class.
Classes can be individual users, PermissionsGroup objects, or overall classes such as All or "Authenticated".
ClearPermissions[All] only removes permissions explicitly given for the class All; SetPermissions["Private"] removes all permissions.

Examples

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Create a cloud object:

Remove permission specifications for PermissionsGroup["group1"]:

ClearPermissions[All] only removes permissions explicitly given for the class All:

SetPermissions["Private"] removes all permissions:

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