(1) If written form is prescribed by statute, the document must be signed by the issuer with their name in their own hand, or by their notarially certified mark.
(2) In the case of a contract, the signature of the parties must be made on the same document. If more than one counterpart of the contract is drawn up, it suffices if each party signs the document intended for the other party.
(3) The written form may be replaced by electronic form, unless the statute leads to a different conclusion.
(4) Notarial recording replaces the written form.