As magic is all about secrets, you might expect magicians' tricks would gain protection under the principle of trade secrets - this is how Coca-Cola guards its recipe and how KFC protects the spices it uses on its chicken, for example.
They say the exemption for privacy was never intended to protect corporations, which have protection against disclosure of trade secrets and other information under a separate section.
In the course of my work over the past three decades as an expert on trade secrets and information protection for hundreds of Fortune 2000 companies, I have reviewed thousands of NDAs.