When you have a toy, you don't want other kids to take it and say it's their own. The same thing happens with ideas called patents, which are like rules for making things. Sometimes, two companies will have a disagreement about who really came up with an idea first.
The Yankee Candle company and the New England Candle company were like two kids fighting over a toy. They both made candles that smelled really good and looked nice too. But Yankee Candle said that some of the ideas and designs that New England Candle was using belonged to them. They even went to court to settle the disagreement.
A judge listened to both sides and decided that some of the things New England Candle was doing were too similar to what Yankee Candle was already doing, and that wasn't okay. So the judge told New England Candle they couldn't do those things anymore and had to pay money to Yankee Candle.
This made it clear that if you come up with an idea or design, you have something special that belongs to you. Nobody else can take it and use it the same way without asking first.