First, copyright is not "ownership of information"

Copyright is acknowledgement of creatorship

Without copyright, I can claim to be the author of Romeo and Juliet or Harry Potter or The Firm - and you can never prove me wrong

Look at countries around the world that either do not recognize or enforce copyright from other locations (or which have no concept for native productions) if you want to know what a "world without copyright" would look like ... it exists already around the globe