Did StackExchange or anyone contact the EFF for this? Seems like a classic misuse of DMCA to suppress speech within the security community based on public data andthat's used under the Fair Use doctrine as stated by the US Copyright Office (http://www.copyright.gov/fls/fl102.html).
The Online Policy Group vs Diebold case is worth looking into. In fact Diebold had a much stronger case than CipherCloud but they still lost to the Fair Use doctrine.
Another helpful read is this article (which also references the above case).
Having said that, instead of offensive legal action, I still think it's best to channel resources on building better ties within the security community and the security industry itself.