Case C-491/10 PPU: Judgment of the Court (First Chamber) of 22 December 2010 (reference for a preliminary ruling from the Oberlandesgericht Celle (Germany)) — Joseba Andoni Aguirre Zarraga v Simone Pelz (Judicial cooperation in civil matters — Regulation (EC) No 2201/2003 — Jurisdiction, recognition and enforcement of judgments in matrimonial matters and matters of parental responsibility — Parental responsibility — Rights of custody — Child abduction — Article 42 — Enforcement of a certified judgment ordering the return of a child handed down by a (Spanish) court with jurisdiction — Power of the requested (German) court to refuse enforcement of that judgment in a case of serious infringement of the child’s rights)