Case T-501/13: Judgment of the General Court of 18 March 2016 — Karl-May-Verlag v OHIM — Constantin Film Produktion (WINNETOU) (Community trade mark — Invalidity proceedings — Community word mark WINNETOU — Absolute ground for refusal — Descriptive character — Article 7(1)(c) of Regulation (EC) No 207/2009 — Article 52(1) and (2) of Regulation No 207/2009 — Principles of autonomy and independence of the Community trade mark — Obligation to state reasons)