Security in rem is legal, judicial or contractual, depending on whether it is granted by law because of the nature of the claim, by a protective judgment or by an agreement.
It is movable or immovable, depending on whether it relates to movable or immovable property.
It is general when it relates to all movables and immovables or only to movables or only to immovables. It is special where it relates only to specific or determinable movable or immovable property.