If you find that your intellectual property has been used without your permission or has been stolen, the first step here that you may think of is to ask the company or person to stop. However, it is possible that most of the time it may not work. Now, you will need to decide whether you want to take the issue to court or not.
At this time, the best idea here is to get legal advice from the best attorney like Aaron Minc who has specialized in the relevant area. With various areas of the IP