• Its author died before 1952 (Mexico had a term of 30 years after the author's death until 1982,^[1] and no copyright term extension in 1982 or later restored copyright to expired works).
• It is an artistic or literary work published before 1918 (Mexico had a term of 30 years since publication until 1948).^[2]
• It is a work of a Mexican government (federal, state, or municipal) and it was published before more than 100 years ago (before 1 January 1926).^[3]
• Anonymous works are considered in the public domain until the author or the owner of the rights are identified.^[4]

1. ↑ See 1963 Art.23(I).
2. ↑ See 1928 Art.1183.
3. ↑ See 1996-2018 Art.29(II).
4. ↑ See 1996-2018 Art. 153.

The author died in 1949, so this work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 75 years or fewer.