Minecraft wiki entry for Book_and_Quill, associated text: Books can be signed by pressing the "Sign" button while in the interface. In Java Edition, when signed, a book bears the name of the player who wrote it and a title chosen upon signing. In Bedrock Edition, the book doesn't display the name of the player as the author; instead, the author can be any text the player wants. After it has been signed, it cannot be edited again – it has turned into a written book.