Why’s (Poignant) Guide to Ruby is released under the Attribution-ShareAlike License. So, yes, please distribute it and print it and read it leisurely in your housecoat. In fact, there will be a contest at the end of the book for Best Housecoat. It’s a coveted award and you should feel honored to even read about it! (Especially if you are reading about it in your soon-to-be-prize-winning housecoat.)