So, imagine you have a favorite toy that you always play with when you're at home. One day, you go to your friend's house and she has the same toy as you! You both start playing with the toy together, but then your friend accidentally breaks it. You get upset and tell her that she needs to buy you a new toy to replace it.
Now, let's say that instead of toys, we're talking about a movie. A man named Art Buchwald wrote a story and Universal Pictures wanted to turn it into a movie. They hired someone named Buck Henry to write the screenplay (which is like a script for a movie). Buck Henry used a lot of Buchwald's original story in his screenplay, but he also made some changes.
When the movie was released, Buchwald saw it and thought it was very similar to his original story. He didn't think Universal Pictures should be able to make a movie based on his story without paying him for it. So, he sued Universal Pictures for copyright infringement, which basically means they used his work without his permission or paying him for it.
The case went to court and the judge, Harold L. Nichols, had to decide if Universal Pictures was allowed to make the movie without Buchwald's permission or if they needed to pay him for using his original story. The judge ultimately decided that Universal Pictures should have paid Buchwald for using his story and not just Buck Henry's screenplay.
This case, Nichols v. Universal Pictures Corp., was important because it established that even if someone makes changes to an original story, they still need to get permission or pay the original author if they use their work in a new way.