I am pretty sure there is quite the gradation between having patents and defending them when competitors do not license them, and being a patent troll existing solely to sue every other company making anything resembling anything in your patent portfolio. Proving prior arts to patents a patent troll has filed can in some cases be a pretty costly process, and the practice of patent trolling does in no way encourage the development of new technology. Kodak isn't the worst offender by a long shot, but they do partake in the practice somewhat. The last weeks, Kodak has sued both Samsung and Fujifilm for, e.g., for a patent sounding a lot like what "live view" is, taking still photos while previewing a motion capture.