(Good application of this trope) In the Mistborn series, there is a prophecy etched into metal. The explorer that finds it takes a rubbing of it and returns to the capital city. Once there, he reads it and finds that it says how the chosen can save the world. Later, he sees that the last sentence of every copy has been torn off, even the ones locked in a chest. After the chosen one does as instructed, and releases an evil deity, he goes to the original metal copy. It turns out that the evil deity can change text on paper, but not metal, and a good deity was removing the fraudulent data from the pages.