I remember attending NOPI Nationals in GA and coming upon a booth with a guy cutting vinyl stickers and there was larger than life the JL Audio logo. I asked the proprietor "What makes you think you can sell our logo for profit?" "Well, anyone who wants advertising wouldn't mind" he answered. "Will you be taking the logo down or do I have to unleash the lawyers?"... he took our logos down.
Another time, a retailer opened up and called himself "JL Audio" because his initials were "JL". I called him and explained that "JL Audio" is owned by our company and that doesn't change because of your initials. His response was "OK, I'll change the name if you pay for my new sign, new shirts and new business cards for my staff." I said,"no, this is the courtesy call before the lawyers get involved... we don't pay you to not steal from us." He stuck to his guns and got sued... and lost.