No that's the same as requiring software to be written in Java. That's allowed as you have a business interest. But banning a contractor to use additional emplo

No that's the same as requiring software to be written in Java. That's allowed as you have a business interest. But banning a contractor to use additional employees/subcontractors for their work is not your business, unless it's an employee. Sensitive information can restrict this but you wouldn't send those to a contractor anyway, in this case they'd likely work in-house.