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||This work was first published in Chad and is now in the public domain because its copyright protection has expired by virtue of the Law No. 005/PR/2003 of May 2nd, 2003 on the Protection of Copyright, Neighboring rights and Expressions of Folklore. The work meets one of the following criteria:
- 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 audiovisual or sound recording and 50 years have passed since the date of its publication
- It is a collective work, and 50 years have passed since the date of its publication
- It is another kind of work, and 70 years have passed since the year of death of the author (or last-surviving author)
- It is one of "any official text of a legislative, administrative or legal nature, or any translation thereof"