The original French text of the book “Discours de la méthode pour bien conduire sa raison, et chercher la verité dans les sciences” authored by René Descartes is/are in the public domain and not protected by copyright because at least 100 years (viz. 375) have passed since the author’s death in 1650.

The Spanish translation of the book “Discours de la méthode pour bien conduire sa raison, et chercher la verité dans les sciences” (“Discurso del método para conducir bien la propia razón y buscar la verdad en las ciencias”) authored by Manuel García Morente is/are in the public domain and not protected by copyright in a number of countries because at least 70 years (viz. 83) have passed since the author’s death in 1942.