This work was first published in Ethiopia and is now in the public domain because its copyright protection has expired by virtue of the Proclamation No. 410/2004 on Copyright and Neighboring Rights Protection, enacted 2004 (details). The work meets one of the following criteria:

It is an anonymous, pseudonymous or posthumous work and 50 years have passed since the date of its publication
It is a collective or audiovisual work and 50 years have passed since the date of its publication
It is a photographic work, and 25 years have passed since the date of its creation (or publication, 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 "any official text of a legislative, administrative or of legal nature, as well as official translations thereof"

Per U.S. Circ. 38a., Ethiopia is not a participant in the Berne Convention or any other treaty on copyright with the United States.

As such, works published by citizens of Ethiopia in Ethiopia are usually not subject to copyright protection outside of these countries. Hence, such works may be in the public domain in most other countries worldwide.

However

Works published in Ethiopia by citizens or permanent residents of other countries that are signatories to the Berne Convention or any other treaty on copyright will still be protected in their home country and internationally as well as locally by local copyright law.
Similarly, works published outside of Ethiopia within 30 days of publication within these countries will also usually be subject to protection in the foreign country of publication. When works are subject to copyright outside of these countries, the term of such copyright protection may exceed the term of copyright inside them.
Unpublished works from Ethiopia may be fully copyrighted.
A work from Ethiopia may become copyrighted in the United States under the URAA if Ethiopia enters a copyright treaty or agreement with the United States and the work is still under copyright in Ethiopia.

Ethiopia has enacted a copyright law as published in the Official Gazette (unofficial English (WIPO) translation) which came into force on 19 July 2004.

See also