Case C-50/12 P: Judgment of the Court (Grand Chamber) of 26 November 2013 — Kendrion NV v European Commission (Appeal — Competition — Cartels — Industrial plastic bags sector — Whether the infringement by a subsidiary may be attributed to the parent company — Joint and several liability of the parent company for the payment of the fine imposed on the subsidiary — Excessive length of the proceedings before the General Court — Principle of effective legal protection)