Disclaimer: I'm not a lawyer, so this is just a naive suggestion but I'd like to hear some informed discussion on the issue:

Couldn't a company like Intellectual Ventures be prosecuted under some form of antitrust law? There seems to be evidence of predatory behavior and the nature of how they do business seems to violate a few main goals of antitrust law, namely to prohibit agreements or practices that restrict free trading and competition between business and to ban abusive behavior by a firm dominating a market, or anti-competitive practices that tend to lead to such a dominant position.