According to Law 13714 (1961), under the administration of the government of Manuel Prado, and article 3 of the Universal Copyright Convention, this work entered the public domain in Peru because the original work was created and published without relevant information of its authors before December 31, 1980, and its local copyright expired before May 23, 1996 because:
The photographic, artistic, scientific or literary work did not bear the real name of the natural or legal person, and
This work was not credited or nor registered its name in the National Copyright Registry 15 years after its publication.
However, the work was not renewed on the URAA date (January 1, 1996) and is not protected in the United States. More info in COM:Peru. It is necessary to verify if the publication was not registered or lacks information about the authors during the 15 years of publication. Warning: The Peruvian copyright law of 23 April 1996 repealed law 13714, in its transitory provisions it indicates that only "[the works still] protected in accordance with the previous law, will enjoy the most extensive terms of protection recognized in this Law" and denies retroactive effect.
Note: Note: The cases of anonymous photography and amateur video are "media not appropriate to their nature" and therefore are not protected by law as authors in the Andean Community. But, scripts, scores and other artistic interpretations could be separately protected by natural or legal entity.
Author rights expire eighty (80) years after the death of the author or the death of the last coauthor.
Where the copyright has been transferred by means of an act between living persons, the protection period still remains for eighty (80) years after the death of the author.
The rights for collective works and anonymous works expires eighty (80) years from the date of publication, and for cinematic works, eighty (80) years after the movie's premiere.
In all cases where a literary, scientific or artistic work has as its owner a legal entity or an official body or any institution under government public law, the term of protection shall be deemed to be seventy (70) years as from the date of publication.
In all cases where the applicable term of protection starts on the date of publication, the said term shall be understood to end on December 31 of the relevant year.
The author and the work source must be acknowledged when reused in Colombia, except if the author is unknown.
{{Information |Description= El ejército colombiano en maniobras para contrarrestar la agresión peruana |Source= www.lablaa.org/blaavirtual/revistas/credencial/abril2004/contenido.htm |Date= 1932 |Author= |Permission= |other_versions= }}