1. The co-responsibility levy shall be due from all milk producers whose farms are not situated in one of the regions referred to in Article 1 (2) of Regulation (EEC) No 1079/77 in respect of all cows' milk bought from them in the natural state by an undertaking treating or processing milk and delivered on or after 16 September 1977.
2. For the purposes of this Regulation: (a) an undertaking treating or processing milk means both: - a purchasing body which is an association treating or processing milk,
- an undertaking or association which purchases milk, but which restricts its activities to collection, storage and cooling operations or to one of these operations;
(b) delivery means any delivery, whether transport is carried out by the producer himself, by the undertaking purchasing the milk or through a third party.
3. However, quantities of milk sold by one producer to another producer shall be exempted from the levy, provided that: - the latter markets them directly as drinking milk, and
- the total quantity of milk purchased by this latter producer does not exceed 3 000 kilograms per year.