Not to jump on this newly started bandwagon but I thought SOPA was explicitly about copyright, IIRC most of the defenses of the bill explicitly state SOPA is designed to "protect creativity," which ultimately explicit means the defense of intellectual property and even the rights of "copyright holders." Seriously google the bill and the words intellectual property will come up. (Of course because the bill was produced from lobbying this merely means coperations who, by this government in several other instances in the past decade, were deemed to be individuals are going to be protected. And because the defense of creativity is so broad it simply amounts to removing whatever these "individuals" deem to be harmful to their creativity).
But while the bill was explicitly stated to be about copyright, I think that's not getting the big picture, it has to be about more... well, there definitely is more at stake for us. Information itself will no longer be free, once information becomes thoroughly made into a commodity, individual empowerment and even knowledge itself will begin to disappear. But again, this is about money; nothing can be free and everything must be owned. If the internet has content that can be claimed by individuals, then they will continue this process, they have both time and money on their side.
And surely cooperations do lose out when information is free, in fact in this system, information is naturally asymmetric. The internet if it begins to be taken seriously, could possibly mitigate if not help liberate us from the disadvantages of asymmetric information. People were asking earlier why consumer products, cosmetics, pharmaceutical, and other random groups are supporting this bill? It's obvious, to me, and maybe I'm going on a limb but I think the less people know about these companies and their products and services, hell the less people know period, is of any company's interest. Uniformed consumers, ignorant consumers are any company's dream you could sell them anything, convince them of whatever you want. Information is heavily processed through advertising and through media conglomerates; outside of the internet, information is already a commodity. Once we get rid of the internet, information will be nearly rendered to private interests.