Licenses/permissions and further contracts or declarations concerning copyright are only granted or agreed upon in writing (original with handwritten signature) or with a digital signature (using smart cards) by the rights holder.
No legal obligation concerning copyright may be created verbally or in text form (email, fax, etc.) without the digital signature of a smart card.
No culpa in contrahendo
Liability in the event of a contract not being concluded is excluded (no culpa in contrahendo). In particular, we reserve the right to refuse until a contract has been concluded (timely receipt of the countersigned document).