The Copyright Cage Bars can't have TVs bigger than 55 inches. Teddy bears can't include tape decks. Girl Scouts who sing "Puff, the Magic Dragon" owe royalties. Copyright law needs to change. By Jonathan Zittrain A COUPLE OF YEARS AGO I WAS TALKING WITH A LAW SCHOOL COLLEAGUE about cyberlaw and the people who study it. "I've always wondered," he said, "why all the cyberprofs hate copyright." I don't actually hate copyright, and yet I knew just what he meant. Almost all of us who study and write about the law of cyberspace agree that copyright law is a big...