> Since the author is the copyright owner, there is nothing in the guidelines that suggest the handbook is explicitly prohibited
How is Amazon supposed to know that the author is the copyright owner? As far as I can see, when they asked about the book being on the web and for him to confirm that he had publishing rights, all he told them was that it was under a free license. I suspect that Amazon is, quite reasonably, interpreting this response as meaning that he is NOT the author, and just has the publishing rights granted by that free license.
If he is indeed the author, his response should have been: "I am the author of this work and the sole copyright owner. It is available on several web sites because I have made it available under a free license".
How is Amazon supposed to know that the author is the copyright owner? As far as I can see, when they asked about the book being on the web and for him to confirm that he had publishing rights, all he told them was that it was under a free license. I suspect that Amazon is, quite reasonably, interpreting this response as meaning that he is NOT the author, and just has the publishing rights granted by that free license.
If he is indeed the author, his response should have been: "I am the author of this work and the sole copyright owner. It is available on several web sites because I have made it available under a free license".