I have been searching for this but couldn't find any answer, let's say a company has a generic public platform where people can upload text, images, videos, audio, ... how are they supposed to be able to check for copyright infringment against every single upload?<p>I know that Youtube has its own content id system, but for anyone without YT's resouces, is ther any 3rd party service to which you can pass content and get back a yes/no answer to "anyone copyrighted this thing?", if yes, what are the costs? the effectiveness?