(4)In view of establishing the scope of the exemption from the certification obligation for hops grown and/or processed for breweries under contract or by the breweries themselves, while still ensuring a supervision by the competent certification authority, the brewer should inform the competent certification authority through a harvest declaration about the varieties grown, the quantities harvested, the places of production and the areas planted in order to ensure that the products in question are only for the use of the brewery concerned. As far as the processing of hops for breweries is concerned, the certification authority should be provided with advance information about the brewery concerned, the processor, the raw material and the final product to enable a certain supervision of the process. The packaging of those products should also carry a special mention that they may not be marketed to ensure that they can only be used by the brewery in question.