Case T-808/14: Judgment of the General Court of 15 December 2016 — Spain v Commission (State aid — Digital television — Aid for the deployment of digital terrestrial television in remote and less-urbanised areas of Castilla-La Mancha — Decision declaring the aid incompatible with the internal market — Concept of ‘undertaking’ — Economic activity — Advantage — Service of general economic interest — Distortion of competition — Article 107(3)(c) TFEU — Duty of diligence — Reasonable period — Legal certainty — Equal treatment — Proportionality — Subsidiarity — Right to information)