Retention of Title
The seller stays the owner until full payment.
With retention of title, the purchased item remains the seller's property until it is fully paid for, even though you are already using it. If you do not pay, the seller can demand its return. This is common with installment purchases and supplier deliveries.
The relevant statutes
§ 449 BGB
What you can do now
The app creates the right letter with the correct statutes for you, free of charge and without signing up.
Related terms
General explanation for self-help, not legal advice (RDG). Individual cases may differ: if in doubt, contact a consumer advice center or a lawyer.