A more thorough explanation:

Definition: Bonae fidei possessor is a Latin term used in Roman law to refer to a person who possesses property owned by another in good faith. If the owner does not sue to recover the property, the possessor becomes the rightful owner after a specified time, unless the property was stolen or taken by force. This concept is similar to the legal doctrine of adverse possession.

An example of bonae fidei possessor would be a person who purchases a car from a dealer in good faith, without knowing that the car was stolen. If the true owner of the car does not sue to recover it within a certain period of time, the purchaser becomes the rightful owner of the car.

Another example would be a tenant who rents a house from a landlord who does not actually own the property. If the true owner of the property does not take legal action to recover it within a certain period of time, the tenant may become the rightful owner of the property.

These examples illustrate the concept of bonae fidei possessor because in both cases, the possessor (the car purchaser and the tenant) did not know that the property was owned by someone else. They possessed the property in good faith, and if the true owner did not take legal action to recover it within a certain period of time, the possessor became the rightful owner.