It all depends on what the contract of employment says (if there was one back then) and the policies and procedures of the company at that time. In today's society such a thing is called the 'Company handbook' which outlines what an employee is allowed to do and not allowed to do. Such a handbook also stipulates the responsibilities of the employer.
I know when I moved from manufacturing to Engineering, there was a clause in my contract that stated anything I designed, made or produced whilst under company hours, such designs, documents, drawings and anything else built was the sole property of the company.
The question would now be, was Woz under similar restrictions when he and Job's formed the company. If there is nothing then the schematics are not protected and are Woz's property for him to do as he wishes BUT if there is company documentation back then that stipulates anything designed whilst an employee of Apple and done on during working hours is the property of the company, then the schematics are the property of Apple and can only be shown with Apple's authorisation.