We got hit with one of these letters. I read through it and it was clear that we weren't actually infringing -- it only applied to the use of distribution to employees via the scanner. Luckily that functionality is pretty much impossible to make work on the Brother MFC that we have. We had our lawyer send back a note saying that we weren't infringing and that was the end of it. My guess is that showing that you are actually paying attention and have a competent attorney is a good way to avoid getting victimized (at least some of the time).