|EFF representation of the Tor network: from Tor Project|
It seems to me that copyright control and protection may seriously damage a project like this. If all the exit nodes are shut down because of copyright take down notices we lose a valuable tool in preserving our freedom of speech as well as an assumed right to use the internet in the way we feel is best.
Another concern I have about this technology is the obvious potential use by hackers. This tool is going to be used by hackers. It would be foolish for them not to. This of course puts this technology at odds with the wishes of the government to control copyright infringement and prevent hacking of businesses and government agencies. I seriously hope that the US government, and the EU, gives protection to the exit nodes from legal repercussions from hackers using these networks. Used in the right way Tor could be a modern Underground Railroad for dissenters in countries like Libya, Yemen, and Saudi Arabia.