Article 43 of Qatar Labor Law (no compete)

Guys..Article (43) states...

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.

My question is...

1. is this law applies to all workers?
2. or it covers only those workers, that after completing his contract, will join another company that belongs to the same industry of his former employer? Will this law applies to an accountant coming from the oil n gas industry...then jumping to the financial sector like banks?

Any body please enlighten me...thank you.
But if the above topic have been decided before on previous forums..provide the link please for the benefits of us newbies...thank you guys.:)