Case C-684/21, Papierfabriek Doetinchem: Judgment of the Court (Tenth Chamber) of 2 March 2023 (request for a preliminary ruling from the Oberlandesgericht Düsseldorf — Germany) — Papierfabriek Doetinchem BV v Sprick GmbH Bielefelder Papier- und Wellpappenwerk & Co. (Reference for a preliminary ruling — Intellectual property — Community designs — Regulation (EC) No 6/2002 — Article 8(1) — Features of appearance of a product dictated solely by its technical function — Criteria for assessment — Existence of alternative designs — Proprietor also holding a multitude of alternative protected designs — Multicolour appearance of a product not reflected in the registration of the design concerned)