The complete story: https://www.bluejeanscable.com/legal/mcp/index.htm
For anybody who’s wondering what happened next, this is from the above link: “Monster's counsel had made a horrible mistake, and probably caused lasting harm to the company, by sending me that ridiculous letter. But he, and Monster, did apparently know the first rule of holes: "If you find yourself in a hole, stop digging." The end, therefore, of the story was a bit anticlimactic. Knowing that I was able to defend my…
If that really is the reason you’re threatening action against someone, they may just understand if you’re nice about it!
That said, while it may foster more goodwill towards your company, it probably isn’t as surefire a way to generate the swift response you want as being a dick and making the threats