The EPO as a matter of course notifies those concerned of decisions and summonses, and of any notice or other communication from which a time limit is reckoned, or of which those concerned must be notified under other provisions of the EPC, or of which notification has been ordered by the President of the EPO. Notifications may, where exceptional circumstances so require, be given through the intermediary of the central industrial property offices of the Contracting States. In proceedings before the EPO, any notification to be made must take the form either of the original document, a copy thereof certified by, or bearing the seal of, the EPO, or a computer print-out bearing such seal. Copies of documents emanating from the parties themselves do not require such certification.