If they want it protected to this degree, they shouldn’t broadcast it. What’s next? Will there be lawsuits to stop you from making food at home inspired by restaurants?
People learning songs by playing by ear and even proforming them is one thing.
Selling sheetmusic that you may ‘claim’ to have done the by ear method to learn is another.
And yes, making a cookbook based on a restraunts recipe should and is illgal if they have taken the steps to protect the recipe.
I’ll bet you are under 30 and do not value personal property rights whatsoever.