Another group encrypted the original DeCSS source code by splitting it up and hiding it in the image encoding of a picture of a cow - and then set up a service that attached alternate halves of this image to comments emailed to the U.S. Copyright Office, which will then become part of the public record, thereby enabling anyone with the encryption key to view the DeCSS source code. The DeCSS opponents would have to break the encryption to see that the 'illegal' code had been distributed, though, and their own argument is that this sort of encryption reverse-engineering is illegal copyright infringement, so although they'd rather squelch the distribution, they're in a bit of a bind.
Culture jamming is very cool. A brilliant tactic indeed, to put the bad guys at the mercy of their own machinations.