1. A method in a Presence System for authorizing a Watcher to access Presence information associated with a Presentity, the method comprising the following steps: a) receiving from the Watcher a request for said Presence information; b) acquiring instructions indicating that an authorization instance other then the Presentity shall be given an opportunity to change or verify an authorization rule associated with the request for presence information; c) notifying the authorization instance of the request for presence information, thereby enabling the authorization instance to change or verify the authorization rule, and d) making a final decision on the authorization rule on the basis of the instructions and a notification indicating a change or a verification of the authorization rule, in case such a notification is received from the authorization instance, or on the basis of a default authorization rule of the instructions, in case no such notification is received, wherein repeating step c) for at least one additional authorization instance other than the Presentity according to the instructions, before executing step d) and the order of authorization instances is determined on the basis of an authority list being included in the instructions, such that the authorization instance being appointed the highest authority is notified first.