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Tor, an online anonymity network, allows people to technically circumvent SOPA should it become law. However, its existence is threatened by the bill should it become law.
"Now, while we hear that DNS-blocking is off the table, the bills remain threatening to the network of intermediaries who carry online speech. Most critically to Tor, SOPA contained a provision forbidding "circumvention" of court-ordered blocking that was written broadly enough that it could apply to Tor -- which helps its users to "circumvent" local-network censorship", read the blog post.
You can read Tor's comments here.