Just like every businessperson, you want to protect your intellectual property. It is your creation, so why should someone else be able to use it? You did not authorize this person to use it and he or she did not put the time, money, and hard work into creating, filing, and securing the intellectual property. In order to protect your intellectual property you must be proactive not just reactive. Of course, if something happens you must react appropriately and resolve the problem to your liking. You do not want to just let things slide and have people get away with unethical and illegal behavior. However, if you are proactive regularly you will find that you can avoid many more of these situations. You could hire a law firm to regularly look into any concerns you have regarding your intellectual property. You could also hire a watching service to scan for adverse trademarks. In addition, always make sure you abide by the laws applicable to your intellectual property.