system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 the Google v. Oracle case

Specifically the whole debate over copywrite law regarding programming languages.
gpt
Oracle bought a company (Sun Microsystems) that had created the Java programming language.  Now think of a programming language like a car.  The concept of a vehicle with four wheels and some motor can't (currently) be copyrighted by any one company.  A specific car has parts designed by a company (or companies) that are the property of the company (a motor by BMW, tires by Michelin, etc).  

Now Oracle creates the 'Java' car, using a motor, wheels, seats, all designed by Oracle (really Sun).  Google came along and said, let's make our own 'Android' car, but we want it to still be usable by people who know how to use a 'Java' car.  So Google (supposedly) went and created an 'Android' car from the ground up, not trying to figure out how the 'Java' car was created, but taking the concepts of a motor, wheels, steering wheel, etc.  The 'Android' car can still be used by a person who knows how to operate a 'Java' car, although the motor is meant to run on a different fuel, the wheels are smaller, and the seats are shaped differently.  

Now, even though the 'Android' car is not the same as the 'Java' car under the hood, Oracle is claiming that the concept of a vehicle with four wheels, a steering wheel, and a motor is property of Oracle, and that the 'Android' car is just a "...cheap knockoff..." (actual quote) of the 'Java' car.  

The real danger of this case is that Oracle will lock down the concept of a 'car' as property of a company.  A company could make a three-wheeled motor cycle, for example, and another company could come along and say, "no, we invented the tricycle 100 years ago, and we demand you pay us money for licensing our 'three-wheeled vehicle design'".