I've been sued by patent trolls that somehow got a patent on live streaming video to the browser way past where we were doing it in public. Others have been on the receiving end of similar lawsuits. Fortunately our efforts were very well documented so we managed to get rid of them but it was quite annoying that such a patent ever got granted. Especially because I made a conscious decision not to patent it myself because I felt it was a trivial thing and the time was simply ripe for doing it.