You as the reader do not have the rights to republish a book in any way. As such, all books are under their own respective copyrights and should thus ONLY be converted for personal use. Furthermore, you should adhere to all copyrights that are placed on this material by authors, publishers and owners.
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http://www.copyrightkids.org/definitions.html#fairuse

http://en.wikipedia.org/wiki/Fair_use