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qrpff.pl is an obfuscated Perl program, written by Keith Winstein and
Marc Horowitz of MIT. It decodes CSS, the content scrambling system
used to encode video data on DVDs.
Wired magazine recently asked me to write a short article explaining
how qrpff.pl worked. Wired being what it is, I knew that no matter how
little informative content I actually included, it would be too
much---they would assiduously remove all actual information from my
article, and the result would be a piece which would give the reader a
warm fealing of having understood, but without actually imparting
anything of value. That's what Wired is about: The illusion of
knowledge without and of the difficult bits. Sure enough, that is what
happened.
I have made my original draft available online at
http://perl.plover.com/qrpff/
in case you are interested.
Mark-Jason Dominus mjd@plover.com
I am boycotting Amazon. See http://www.plover.com/~mjd/amazon.html for details.
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