Case C-106/16: Judgment of the Court (Grand Chamber) of 25 October 2017 (request for a preliminary ruling from the Sąd Najwyższy — Poland) — Proceedings brought by POLBUD — WYKONAWSTWO sp. z o.o., in liquidation (Reference for a preliminary ruling — Freedom of establishment — Cross-border conversion of a company — Transfer of its registered office without transfer of its real head office — Refusal to remove it from the commercial register — National legislation whereby removal from commercial register is dependent on the winding up of a company after a liquidation procedure — Scope of freedom of establishment — Restriction on freedom of establishment — Protection of the interests of creditors, minority shareholders and employees — Prevention of abusive practices)