You can set your own rules regarding books. If you profit from a book, you must buy it, no questions answered. If you pass the 50th page, go buy it. Same app

You can set your own rules regarding books. If you profit from a book, you must buy it, no questions answered. If you pass the 50th page, go buy it. Same applies to software... if you are generating income with it, you must buy it. Rest is up to your conscience.