Vgl. auch zum Eigentumsvorbehalt (retention of title):
A straightforward retention of title clause within a contract of sale essentially means that ownership remains with the supplier, until full payment for the goods has been received.
Das Eigentum verbleibt also trotz Besitzübertragung beim Verkäufer.
The recognised property rights in German law are, in particular:41 (1) full real right (dingliches Vollrecht): this is ownership (Eigentum, § 903 BGB), the most comprehensive real right. It is strictly distinguished from possession (Besitz, § 854 BGB), which is not a (real) right, but the factual holding of a thing in one’s power with the intention to do so.