Baker v. Selden, 101 U.S. 99 (1879)
Plaintiff made a book that discussed a booking style. Later someone copied the forms from the book.
Are forms in a book that describe how to do something copyrightable?
A system is not copyrightable.
Forms are not copyrightable. Just because you write about how to do something does not mean that you copyright the something you are teaching.
The forms in the book were simply implementing the system. Although the system was new, the forms were just dictating the system and not original.