I just had an opp (in-house) counsel admit they infringed ("accidentally" of course), pointed out additional uses, apologized, and said they wanted to make it right...all in their first response to my letter. It was polite, forthright, and it was the first time that has happened in over a decade. 

Now, I am inclined to trust them a lot more and expect we will resolve this matter shortly and without anyone taking it in the shorts. All because they did the right thing. 

Sad that's so rare.