But editors in search of a legal word limit are sorely disappointed. Even before the Internet, lawyers lamented that the fair use factors “didn’t map well onto real life,” said Mr. Ardia, whose Citizen Media Law Project is part of the Berkman Center at Harvard Law School. “New modes of creation, reuse, mixing and mash-ups made possible by digital technologies and the Internet have made it even more clear that Congress’s attempt to define fair use is woefully inadequate.