Case C-200/16: Judgment of the Court (Tenth Chamber) of 19 October 2017 (request for a preliminary ruling from the Supremo Tribunal de Justiça — Portugal) — Securitas — Serviços e Tecnologia de Segurança SA v ICTS Portugal — Consultadoria de Aviação Comercial SA, Arthur George Resendes and Others (Reference for a preliminary ruling — Directive 2001/23/EC — Article 1(1) — Transfers of undertakings or businesses — Safeguarding of employees’ rights — Obligation on the transferee to take on workers — Provision of security guard services carried out by an undertaking — Call for tenders — Award of the contract to another undertaking — Employees not taken on — National provision excluding from the ‘concept of a transfer of an undertaking or business’ the loss of a customer by an operator following the award of a service contract to another operator)