It is an anonymous work, pseudonymous or posthumous work and 50 years have passed since the date of its publication (or creation, whatever date is the latest)
It is a photographic work or a work of applied art and 20 and years have passed since the date of its creation
It is a sound recording, a cinematographic or audiovisual work, and 50 years have passed since the date of its publication (or creation, whatever date is the latest)
It is another kind of work, and 50 years have passed since the year of death of the author (or last-surviving author)
It is one of "laws, official texts of administrative or judical nature, or to the official translations thereof"