Article (43) Any condition in a service contract shall be void when it contains an undertaking by the worker to work for the rest of his life with the employer or to abstain from carrying out any craft or profession which may be carried out after leaving the work even if the contract is agreed before the coming into force of this law. If the nature of the work allows the worker to know the clients of the employer or the secrets of the business of the establishment, the employer may stipulate that the worker shall not compete with him or participate in any undertaking competing with him after expiry of the contract. Such stipulation shall be valid only if it is restricted as to its duration and place and to type of the work to the extent necessary for the protection of the legitimate interests of the employer. The period of such undertaking shall not exceed two years.