There was some discussion of this (potentially restricted speech) at
[[Wikipedia Cookbook/Talk]].
[1] BTW, I've now searched for all four terms, and
found nothing
concrete.
Also, Dr. David Touretzky at carnegie-mellon is knowledgeable about
both DeCSS and Adobe encryption and various other first amendment
issues ignored by the DMCA (and, it seems, the Church of Scientology);
his arguments seem generally lucid and measured; you can visit his
page at
http://www.cs.cmu.edu/~dst/ if you care to.
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