The Latin expression Res nullius translates to "nobody's thing," designating, within the scope of Civil Law and Property Law, movable assets that have no owner, either because they have never been subject to appropriation or because they have been abandoned. Its main legal purpose is to substantiate the institute of occupation as an original mode of property acquisition, establishing the criteria of legality for an individual to integrate a certain asset into their private estate without transmission from another party.
Concept and Foundation
In the rigor of legal taxonomy, res nullius is qualified as a type of asset that is outside the estate of any subject of law, but which is legally susceptible to appropriation. It differs fundamentally from res derelictae (abandoned things), although both receive similar legal treatment regarding the possibility of occupation. While res nullius has never had an owner (such as hunting or fishing in a state of freedom), res derelictae presupposes the existence of a previous owner who manifested the unequivocal will to divest themselves of ownership (animus derelinquendi).
The legal nature of the institute lies in the classification of assets regarding their ownership. It is a disposable legal object that, through the material act of occupation (occupatio), allows for the acquisition of property in an original manner. This means that the new owner does not hold any legal bond with predecessors, with no transmission of burdens or liens that might have fallen upon the asset in past moments.
Historical Origin and Evolution
The concept dates back to Classical Roman Law, specifically to the ius gentium, where occupation was considered the most natural way to acquire ownership. According to the Institutes of Gaius and, later, Justinian, things that belonged to no one became the property of the first person to occupy them (quod enim nullius est id ratione naturali occupanti conceditur). This regime applied to wild animals, precious stones found on the coast, and goods captured from the enemy in times of war.
With the evolution to modern Civil Law and the Napoleonic codification, the concept was restricted by the social function of property and state intervention. In Brazil, the 1916 Civil Code already provided for occupation, but it was the 2002 Civil Code that refined the institute, adapting it to contemporary administrative and environmental limitations. The most notable evolution lies in the transition of assets that were considered res nullius (such as wildlife) to the category of assets of public interest or assets of the Union, according to specific environmental legislation.
Exact Legal Provision
The primary legal foundation of res nullius and its respective acquisition is found in the Brazilian Civil Code (Law No. 10.406/2002):
- Art. 1.263: "Whoever takes possession of a thing without an owner immediately acquires ownership of it, provided that such occupation is not prohibited by law."
This provision enshrines occupation as a mode of acquiring movable property. Complementarily, the Code deals with specific forms that relate to the concept:
- Art. 1.264 to 1.266: Deal with "Treasure" (an ancient deposit of precious things, hidden and of whose owner there is no memory), which shares the nature of unknown ownership, although it has a specific division regime between the finder and the owner of the building.
- Art. 1.275, item IV: Establishes abandonment as a cause for loss of property, transforming the res into derelictae, suitable to be treated as nullius for the purposes of occupation by third parties.
Practical Application and Jurisprudential Understanding
The practical application of the concept of res nullius has suffered severe restrictions with the advent of Public Law norms. The understanding consolidated by the Superior Courts (STF and STJ) points out that not everything that seems "without an owner" can be the object of private appropriation.
1. Wildlife: Formerly the classic example of res nullius, wildlife is now governed by Law No. 5.197/1967 (Fauna Protection Law). The STJ has established jurisprudence to the effect that wild animals are assets of common use by the people, under the tutelage of the State, and are not subject to appropriation by simple occupation, except in the strict cases of authorized hunting. Therefore, the res nullius nature of fauna has been mitigated by public environmental interest.
2. Fishing: Fishing activity still retains vestiges of res nullius, where the fisherman acquires ownership of the captured specimen by the act of occupation, provided that the norms of Law No. 11.959/2009 and the closed seasons are respected. The STJ, in cases involving environmental crimes, reinforces that appropriation outside legal limits constitutes an illicit act, precluding the protection of Art. 1.263 of the Civil Code.
3. Abandoned Things (Res derelictae): In Labor Law and Civil Law, the disposal of goods in trash or public collection points is interpreted as a waiver of ownership. Discarded goods are treated as res nullius, allowing waste pickers and recycling companies to acquire original ownership at the time of collection.
Related Principles and Doctrinal Divergences
The institute dialogues directly with the Principle of the Social Function of Property. Modern doctrine, led by jurists such as Francisco Amaral and Nelson Rosenvald, discusses whether the abandonment of real estate could generate res nullius. The majority conclusion is negative: abandoned real estate does not become res nullius, but rather collectable as vacant property, potentially passing to the domain of the Municipality or the Federal District after the legal deadline (Art. 1.276, CC), which prevents acquisition by direct occupation.
There is also disagreement regarding "Loss of Property by Abandonment" versus "Mere Negligence". For an asset to be considered subject to occupation as res nullius, there must be the corpus (detachment from the thing) and the animus (will to no longer be the owner). Mere loss (res deperditae) does not authorize occupation; whoever finds someone else's lost property must return it, under penalty of committing the crime of appropriation of found property (Art. 169, sole paragraph, II, of the Penal Code).
Contemporary Relevance and Practical Impacts
The current relevance of res nullius manifests strongly in the Circular Economy and Space Law. In Space Law (1967 Outer Space Treaty, ratified by Brazil), celestial bodies and the Moon are defined as res communis omnium (common thing of all) and not res nullius, prohibiting national or private appropriation through occupation.
In the technological sphere, the nature of data and information without clear ownership or "orphan works" in Copyright Law is discussed. Although Brazilian Copyright Law (Law 9.610/98) protects the work until it falls into the public domain, the concept of res nullius is evoked analogously to justify the use of abandoned digital assets or those without traceable authorship, although the doctrine still lacks consensus on the appropriation of intangible assets via this path.
Legal and Jurisprudential References
- BRAZIL. Law No. 10.406, of January 10, 2002. Civil Code. Articles 1.263, 1.264, 1.275, and 1.276.
- BRAZIL. Law No. 5.197, of January 3, 1967. Provides for the protection of fauna and other measures.
- BRAZIL. Superior Court of Justice (STJ). Special Appeal No. 1.128.722/SP. Rapporteur: Minister Castro Meira. Judged on 10/13/2009 (Deals with the legal nature of wildlife).
- BRAZIL. Penal Code. Decree-Law No. 2.848/1940. Article 169 (Appropriation of found property).
- UN. Treaty on Principles Governing the Activities of States in the Exploration and Use of Outer Space (1967).
