Case T-582/15: Judgment of the General Court of 11 July 2019 — Silver Plastics and Johannes Reifenhäuser v Commission (Competition — Cartels — Retail food packaging market — Decision finding an infringement of Article 101 TFEU — Evidence of involvement in a cartel — Single and continuous infringement — Principle of equality of arms — ‘Right to confront’ — 2006 Leniency Notice — Significant added value — Attributability of unlawful conduct — 2006 Guidelines for calculating the amount of fines — Proportionality — Equal treatment — Upper limit of the fine)