Get a book contract. This content has been identified by the end of the contract, the buyer does not request advance payments. The company can sell its products to be .
Get a book contract canceled, in which content is determined at the end of the contract, the buyer may not claim advance payment and we can bring an item to sell. .
Get a book contract, cancel the end of the Content specified in the contract The Buyer shall not be claimed and paid in advance, the company can take the products to be sold