2 Scholars Face Off in Copyright Clash

Should we protect intellectual property by limiting the discussion of decryption research?

By ANDREA L. FOSTER

Pittsburgh

Amid the clutter of David S. Touretzky's office at Carnegie Mellon University is a T-shirt that brings a smile to his face. It features a computer code used to unlock digitally encrypted DVD movies. That's not why he likes it -- he hasn't tried to watch movies without...