Case C-62/14: Judgment of the Court (Grand Chamber) of 16 June 2015 (request for a preliminary ruling from the Bundesverfassungsgericht — Germany) — Peter Gauweiler and Others v Deutscher Bundestag (Reference for a preliminary ruling — Economic and monetary policy — Decisions of the Governing Council of the European Central Bank (ECB) on a number of technical features regarding the Eurosystem’s outright monetary transactions in secondary sovereign bond markets — Articles 119 TFEU and 127 TFEU — Powers conferred on the ECB and the European System of Central Banks — Monetary policy transmission mechanism — Maintenance of price stability — Proportionality — Article 123 TFEU — Prohibition of monetary financing of Member States in the euro area)