This is because its author has died, and 50 years have passed since publication, by the virtue of Articles 1653 and 1670 of the Eritrean Civil code. In the case of anonymous works, the publisher becomes the copyright holder per Article 1667.
As such, works published by citizens of these countries in these countries 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.
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