Agents. If the Supplier intends to have third parties (agents) render the services or parts thereof, the Supplier must obtain the approval of the Client in advance. A violation of this provision entitles the Client to withdraw from the contract with immediate effect and source replacements at the Supplier's expense, or to claim a penalty in the amount of 100 000 CZK per violation. Even if the services or any part thereof are rendered by third parties, the Supplier is liable for the delivery of all contractually agreed services and their contingent obligations.