The book title "Rights from Invalid Contracts" may seem contradictory at first glance. However, the author demonstrates that this appearance is misleading. The parties to an invalid contract can have duties of care, the violation of which can trigger claims for damages from the other party. Furthermore, one party may be barred from invoking the invalidity in good faith. In such cases, the counterparty can assert claims for (subsequent) performance despite the invalidity. Particularly relevant in this context are contracts that are form-invalid and agreements made without an invoice. Under certain circumstances, a party may exercise rights of disposition regarding an invalid contract, such as a right of withdrawal. Finally, the book examines the peculiarities of ineffective contracts involving individuals who are not fully legally competent.