Ladin is officially recognised in Trentino and South Tyrol by provincial and national law. Italy signed the European Charter for Regional or Minority Languages of 1991, but it has not ratified it so far. The charter calls for minority rights to be respected and minority languages, to which Ladin belongs, to be appropriately protected and promoted. Starting in the 1990s, the Italian parliament and provincial assembly have passed laws and regulations protecting the Ladin language and culture. A cultural institute was founded to safeguard and educate in the language and culture. School curricula were adapted in order to teach in Ladin, and street signs are being changed to bilingual.