The right to revoke the order is excluded pursuant to § 356 para. 5 BGB (German Civil Code), as ckeller.photo shall only commence with the execution of the contract after the customer has
- has expressly consented to ckeller.photo commencing performance of the contract prior to the expiration of the revocation period, and
- has confirmed his knowledge that by his consent he loses his right of revocation upon commencement of the execution of the contract.