safe harbour
(US safe harbor)
noun
1A place of shelter and safety, especially for ships; also as a mass noun; frequently figurative.
2Originally and chiefly US a provision in a legal or formal document designed to protect a party who makes a legitimate or excusable violation of its terms; frequently attributive.
Origin
Mid 16th century; earliest use found in Barnabe Googe (1540–1594), poet and translator.