this court found the DCMA to be an unconstitutional abridgement to the first amendment, specifically regarding freedom of speech:
http://linas.org/banned/crypto/mpaa-v-2600-agr.htm
this more tangibly talks about the DCMA's effect on freedom of speech:
http://news.bbc.co.uk/1/hi/entertain...ia/1682467.stm
and here's a ZDnet editorial on the internet's surprising lack of freedom of speech:
http://reviews-zdnet.com.com/4520-6033_16-4204930.html
of course, there's always google:
http://www.google.com/search?q=dcma+...UTF-8&oe=UTF-8