A man contracted with a company to work for them on the condition that he not work outside their company; is it permissible for him to violate this condition?

Question:
Honorable Shaykh, may Allah grant you success. He says: A man contracted with a company to work for them on the condition that he not work outside their company. He says: He is working and earning money from other than the company. Is his earnings lawful?

Answer:
If he is a private employee, it is not permissible for him to work for other than the employer. As for if he is a shared employee who works for you and for others, a tailor who sews for you and for others, or anyone who opens a shop to deal with people, this is shared; there is nothing wrong with him working for you and for others. As for a person you have hired daily for a specific job, it is not permissible for him to go and work for other than you, because you have taken his time and bought it from him. This is what they call the private employee.