Hello, sorry if I'm not using the right terms... I'm not very tech saavy. I'm in the middle of self-publishing a digital book. I'd like to ensure that the book is available to people for free even if it's taken off the traditional market. I heard that Ethereum is sort of like BitTorrent but much more secure. Is this the correct understanding? That I can sort of upload my book and ensure that it's always available and that no one can change it?