mare liberum

 
Pronunciation: /ˌmɑːreɪ ˈliːbərʊm, ˈlʌɪbərəm/

noun (plural maria libera /ˌmɑːrɪə ˈliːbərə, ˈlʌɪbərə/)

Law
  • the sea that is open to all nations.

Origin:

Latin, literally 'free sea'