The mass of content owners that could pursue Pinterest aren't organized into an effective cartel. So no, it's not likely Pinterest is going to get assaulted the same way Napster did.<p>That doesn't stop one or two larger content owners from hitting them hard of course. Most likely by the time any of this comes to legal blows Pinterest will have figured out a means to dance around the technicalities of it all. Worst case scenario for Pinterest is that they see a YouTube-like run-in with a media company.<p>The media monsters (eg WSJ, Murdoch) smell that someone out there might, just maybe, be making some money off something they own somewhere, maybe, kinda sorta, possibly. A hint of it is all those animals need. So they're sending out trial balloons for whether there's anything to sue about to grab some cash with no effort.<p>You have to understand, the first thing these guys think when they see something new like a Twitter or Facebook or Pinterest or Tumblr is (do I): partner with it, ignore it, sue it, buy it. You're going to fall into one of those categories.