Fichier:Enrique Peralta Azurdia, Mexico.jpg

1. Ideas, formulas, solutions, concepts, methods, systems, principles, discoveries, processes and inventions of any type;
2. The industrial or commercial use of the ideas contained in the works;
3. Sketches, plans or rules to perform mental actions, games or businesses;
4. Isolated letters, digits or colors;
5. Isolated names and titles or phrases;
6. Simple blank formats or forms to be filled out with any type of information, as well as their manuals;
7. Unauthorized reproductions or imitations of coat-of-arms, flags or emblems of any country, State, municipality or an equivalent political administrative division, or the denominations, rules, symbols, acronyms or emblems of international governmental or nongovernmental organizations, or of any other organization officially recognized, as well as the verbal designation of the same;
8. The informative content of the news; and
9. Information of common use such as proverbs, sayings, legends, events, calendars, and metric scales.

Additionally, Article 49 of Law 33-98 affirms that any work by the state that has not been in use within five years of its original publication shall be in the public domain. The full quote in English reads as follows: "ARTICLE 49. The State or its public entities, municipalities, as well as universities and other educational establishments in the country, shall enjoy the protection established by law, but, where they are declared heirs of copyright and have not made use thereof within five years from the respective declaration, the work shall the public domain."^{[33-98 Title II Chapter V]}