Ask HN: How can a community like HN protect its users from IP trolls?

Just curious, - For example, recently, Fab.com sued a site called touchofmodern.com based on BS copyright and trademark reasons.<p>http://techcrunch.com/2012/08/15/fab-lawsuit-touch-of-modern-whitehawk-ventures/<p>As a developer myself, I am now somewhat skeptical of using a login box with imagery as its background for my app, because that is exactly what fab.com is suing for.<p>Really, this could be the case of you or me or any one of the hackers here on HN someday. How can a community like HN protect/contribute to stop such a nasty trend stiffle innovation and help its users in such scenarios?<p>Disclosure: I DO NOT represent any of the sites above, they are just examples.