I have never been in such a circumstance in entire life, although there was an instance where I was almost involved in a legal squabble at work with a stakeholder which I escaped by the skin of my teeth.Thankfully I haven't been sued, or had any issues with trademark, copyright or anything else. I've lived a relatively tame life to the point I play it very safe with the work I do. I research things, and make sure whatever I do, doesn't turn out to be taking from others or copying something. I'm very precise like that, so I don't risk my own businesses.
But, have you ever been in a court case because of your site/business was sued or taken to court for some reason?