Register of Copyrights: without SOPA, copyright "will ultimately fail"

Full testimony: http://judiciary.house.gov/hearings/pdf/Pallante%2011162011....

Although I strongly suspect that SOPA will stall either in the legislative pipeline or in the courts, I think it behooves opponents of the legislation to address the legitimate points raised here about the interests of copyright holders. The financial cost of creating and launching content into the market can be considerable, and to the extent that technology facilitates piracy the economic impetus to produce high-quality content is correspondingly reduced. Considering that the entertainment industry makes up about 5% of GDP, there's quite a lot of money at stake.

I share the general opposition to censorship, but what sort of enforcement mechanisms would be appropriate against organized infringement carried out for profit?

There's another argument against SOPA.

I remember this woman speaking in the video stream. She's not ignorant, but rather heavily biased and convincing enough to sway others to her position.