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Permissions - An Administrator of a network or computer system(s) has the abilty to grant permissions to such things as files
User Rights - As an Administrator you can determine wich user has the right to access those devices.
According to me:
Permission as related to access files, folders and even on mailboxes
Rights is related how the user is going to access the resources
Policy is something which is defined by organization and deployed for there resources and objects
Simple it is. Permission is the authority to grant something like attributes for a file or a user. Rights is something the user is permitted to do. Hope you are clear