body: I want to upload screenshots of user manuals for different types of cranes on my mobile app to teach users how to operate cranes. Is this illegal?
  
  
  I have seen a website that allows users to download manuals for almost any kinds of products free. Could they have asked all those manufacturers for permission to redistribute the manuals? As far as I remember, the site was pretty famous.
  
  
  
title: Are user manuals copyrighted?