== The lede paragraph == 

 I'm going to object to the lede paragraph as it currently exists because it simultaneously over-inclusive and under-inclusive.  Don't get me wrong, I understand the difficulty of defining "patent troll", see my attempt at my own blog.  However, the current paragraph would seem to include organizations like Technology transfer offices (they're not inventive but do seek licenses and do seek to prevent infringement), but exclude things that aren't companies.  In addition, I think that the phrase "owns some patents" is not exactly helpful; it seems on can be a patent troll by seeking to enforce a single broad patent or by leveraging a huge patent portfolio. 

 Also, I don't think that most people object to the mere idea of licensing and preventing infringement.  What, at least as far as I understand it, people object to is the seeking to enforce weak patents or expecting windfall license fee/royalty payments. 

 Finally, I think that the phrase ""Patent troll" is a pejorative expression." is alittle out of place as its own sentence. mmmbeer /  /