This work was first published in Guinea-Bissau and is now in the public domain because its copyright protection has expired by virtue of the Copyright Code, enacted 1966 (details). The work meets one of the following criteria:
It is an anonymous work or pseudonymous work and 50 years have passed since the date of its publication (or creation, whatever date is the latest)
It is a collective work and 50 years have passed since the date of its publication (or creation, whatever date is the latest)
It is a literary, artistic or scientific work and 50 years have passed since the death of the author (or last-surviving author)
