If you don't want aliens to read your mind, you wear a tinfoil hat.
If you don't want aliens to read your book, you wrap it in a tinfoil dust jacket.
And then, of course, you throw it in the library's book drop.
"My fellow Americans. As a young boy, I dreamed of being a baseball; but tonight I say, we must move forward, not backward; upward, not forward; and always twirling, twirling, twirling towards freedom!" Kang, alien leader from The Simpsons