For the moment, it’s impossible for YouTube to completely stop users from uploading video content that potentially infringes copyright of other video and music creators. But Google’s massively popular video streaming site does a fairly good job of finding copyrighted material, and paying creators of those videos with its Content ID system.
But many people also upload clips of copyrighted material to YouTube in a way that enhances or transforms the content into something new, such as critiques:
…or Autotuned remixes:
source: popsci.com By Jason Lederman