This work was first published on the Libya and is now in the public domain because its copyright protection has expired by virtue of the Copyright Protection Law, enacted 1968. The work meets one of the following criteria:
It is an anonymous work or pseudonymous work and 25 years have passed since the date of its publication
It is a work published after the death of the author and 50 have passed since the year of death of the author (or last-surviving author)
It is a photographic or cinematographic work that is not compositive (artistic in nature) and 5 years have elapsed since the end of the year of its publication
It is a work created by a legal public or private entity and 30 years have passed since the year the work was created
It is another type of work and than 25 years have elapsed since the the year of death of the author (or last-surviving author) and fifty years have elapsed since the year of publication.
It is one of "official documents such as texts of laws, decrees, regulations, international agreements, legal judgements and various official documents"
Observe que esta obra pode não estar em domínio público em países que não aplicam a regra do prazo mais curto e têm direitos autorais mais longos do que o tempo de vida do autor mais 50 anos. Em particular, o México tem 100 anos, a Jamaica tem 95 anos, a Colômbia tem 80 anos, a Guatemala e Samoa têm 75 anos, a Suíça e os Estados Unidos têm 70 anos e a Venezuela tem 60 anos.
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