Question
Specifically, I'm trying to understand what happens in the following example.
Say Author Z creates a copyrighted Book Z and develops a coaching program + methodology around Program Z.
I then become "certified" to teach Program Z and sign a contract whereby "any derivative works are the sole property of Author Z"
How far to the tentacles of this agreement reach? For example, were I to write my own Book ABCXYZ that incorporates fair use material from Book Z (maybe 1 chapter on the general subject) while also adding a substantial amount of new material above and beyond the Z material alone, does this trigger the derivative clause and grant Author Z full rights to my entire Book XYZ?
Or does the "derivative" clause only grant permission to the portion of my book that uses the Z material specifically?
Answer
The question would require you speaking to an attorney to discuss the matter further in order for you to get any sort of guidance on this issue.