It's not as straightforward as all that. Suppose you write a book. The existence of that book is a fact. The words that are in that book are now a fact. Now, I create a book that says, "The following book was written by DennisM, this is a list of the words that are in that book, in order" and then precede to duplicate your book. Those are the words that are in the book, it's a fact, no one can deny that it's a fact. That's not defensible, even though I'm just stating a fact.
We're in a somewhat grey area here, dealing with ethical issues that have never been clearly dealt with before. However, I feel that a general principle of the web applies: If I create some data, and don't at least implicitly give you permission to use it, it's unethical for you to use it.
This is the central idea behind copyright, behind robots.txt, behind plagiarism, and even behind privacy.