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Yes, the PDF is good but you are interpreting it incorrectly in what it covers. It would fully cover a derivative work such as a translation or writing a movie script form a book but not just formatting. I would suggest you use CC (creative commons) to attach to your book. It may be enough to keep some, but not all for taking the book but will at least protect it against someone else taking credit for it by claiming they did the work.
Anything you add is copyrightable but only the part you write.
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