I received a cease and desist letter from a company at one point. After the initial shock, I was able to just work with them with what they wanted - a name chan

I received a cease and desist letter from a company at one point. After the initial shock, I was able to just work with them with what they wanted - a name change and terms added to my product that indicated that I was not associated with them in any way. It was easier than me hiring a lawyer and/or fighting them in court or wherever that would have lead to. And allowed me to keep doing my development. YMMV