Case C-128/22, NORDIC INFO: Judgment of the Court (Grand Chamber) of 5 December 2023 (request for a preliminary ruling from the Nederlandstalige rechtbank van eerste aanleg Brussel — Belgium) — Nordic Info BV v Belgische Staat (Reference for a preliminary ruling — Directive 2004/38/EC — Articles 27 and 29 — Measures restricting the free movement of Union citizens on public health grounds — Measures of general application — National legislation providing for a ban on leaving the national territory in order to engage in non-essential travel to Member States classified as high-risk zones in the context of the COVID-19 pandemic and an obligation for every traveller entering the national territory from one of those Member States to undergo screening tests and to observe quarantine — Schengen Borders Code — Article 23 — Exercise of police powers in the field of public health — Equivalence with the exercise of border checks — Article 25 — Possibility of reintroducing border controls at internal borders in the context of the COVID-19 pandemic — Controls carried out in a Member State as part of measures prohibiting the crossing of borders for the purpose of engaging in non-essential travel from or to States in the Schengen area classified as high-risk zones in the context of the COVID-19 pandemic)