Original sentence: The music was supposed to be have been lost, but it was discovered in 2002 in the archive of the music library of the Sing-Akademie zu Berlin, an independent old choral association with a rich musical tradition.There is also a Deutsche Grammophon recording available, by Il Complesso Barocco, conducted by Alan Curtis.While common sense would lead one to believe that a work presented in 1733 would not have copyright protection (and, even if so, that only Vivaldi's heirs would have these rights) the judicial case was not clear
Edited sentence: The music was supposed to be have been lost, but it was discovered in 2002 in the archive of  the music library of the Sing-Akademie zu Berlin, an independent old choral association with a rich musical tradition.There is also a brillant premiere recording available, by Il Complesso Barocco, conducted by Alan Curtis.While common sense would lead one to believe that a work presented in 1733 would not have copyright protection (and, even if so,  that only Vivaldi's heirs would have these rights) the judicial case was not clear