It's the same as that person getting a book from the library. No stopping anyone from copying patterns from those. I'm not their moral compass and don't want to be. But I don't loan to acquaintances. I can say no in a second and not feel one bit I need to explain. My quilting group friends, all buy the books and patterns that any of us show each other we like. No one has ever asked to borrow from each other anything other then recipes. We can afford alike.