Michael A. Carrier has published "SOPA, PIPA, ACTA, TPP: An Alphabet Soup of Innovation-Stifling Copyright Legislation and Agreements" in the Northwestern Journal of Technology and Intellectual Property.
Here's an excerpt:
In this article, I discuss the effects of four copyright proposals on innovation: the Stop Online Piracy Act (SOPA), PROTECT IP Act (PIPA), Anti-Counterfeiting Trade Agreement (ACTA), and Trans-Pacific Partnership Agreement (TPP). These proposals contain provisions that would impose copyright liability in a vague and far-reaching manner that would harm innovators, dissuade venture capitalists, and ultimately stifle innovation.