Felten is among the many reporting on this New York Times article on door locks. He makes the critical observation that:
This is why we need independent analysis of security technologies. Manufacturers will keep important information from their customers, even information that impacts the basic security decisions of the customers. Bans on security analysis, or bans on the dissemination of results, just help manufacturers keep their customers in the dark. Thank goodness there is no DMCA for door locks.
He also provides a link to the underlying research article.