In the case of repeated violation of the customer's obligations concerning Right of use or Copyrights, the DWD is entitled to terminate the contract with immediate effect. The customer is entitled to the same right in the case that the DWD negligently and repeatedly offends against its liabilities. The contract can be terminated in writing by the customer and by the DWD respectively up to one month at the latest (date as postmarked) prior to the expiry date of the period of use. It is otherwise prolonged automatically for a further year. Any kind of termination must be made in writing.