Computer Systems Laboratory Colloquium
4:15PM, Wednesday, April 4, 2001
NEC Auditorium, Gates Computer Science Building B03
Content Protection for Recordable Media
Jeffrey B. Lotspiech
About the talk:
IBM Almaden Research Center
Content Protection for Recordable Media, or CPRM, is a technology
developed by IBM, Intel, Matsushita, and Toshiba to provide copy
protection on portable media. The technology allows a recorder to
record encrypted content, and a player to play it back, without
having any keys in common. The media acts as a passive oracle
to allow the different boxes to come to the same cryptographic key.
In contrast, previous copy protection technologies like the one
used for DVD video, depended on shared keys between the mastering
studio and the players, with predictable results. As soon as a
16-year-old in Norway found one shared key, the system was
effectively broken: there was no way to exclude the broken
key from the system without hurting too many innocent consumers.
In contrast, CPRM can survive thousands of independent attacks,
and exclude millions of circumvention devices, without any chance
of innocent consumers being affected.
Recently, articles have appeared in the press that CPRM will be
standardized on all PC hard drives. This has fueled Orwellian
mages of a Big Brother chip on your PC that will decide whether
your files are worthy of being copied. This is complete nonsense.
CPRM would never be standardized, nor have we ever proposed such
a thing. CPRM strength is portability and interchangeability and
it is mismatch for fixed hard drive. It is completely passive,
requires no hardware, and can only be exploited by newly-designed
applications. It cannot possibly affect existing files or
applications. How these myths came about, and persist, was an
object lesson for a media-naive researcher.
About the speaker:
Jeff Lotspiech is the manager of the Content Protection Technology
Group at the IBM Almaden Research Center. He has a BS and MS in
Computer Science from MIT, 1972. He has been working on content
protection technologies, both
the Internet and media, for the last six years.
Jeffrey B. Lotspiech
IBM Almaden Research Center DPEM/B3
650 Harry Road
San Jose, CA 95120