Google translation of the following text is so bad that even I couldn't accept it.
Warning: When dealing with non-fiction [de: "Sachliteratur"] - unlike fiction [de: "Belletristik"] - nothing substantial will be added to the material supplied by the customer, and nothing essential will be taken away. The processing of such material therefore consists of its preparation and presentation. We will issue a quotation [= offer on a business] if you inform us of your requirements.
What do you have? - Thanks.