https://arstechnica.com/tech-policy/2021/04/supreme-court-sides-with-google-in-api-copyright-battle-with-oracle/

The Supreme Court has sided with Google in its decade-long legal battle with Oracle over the copyright status of application programming interfaces. The ruling means that Google will not owe Oracle billions of dollars in damages. It also has big implications for the broader software industry, since a ruling in the opposite direction could have triggered a wave of lawsuits against software companies that re-implemented other companies' APIs.

The case dates back to the creation of the Android platform in the mid-2000s. Google decided to base Android on Sun's Java programming language, enabling existing Java programmers to easily develop for the platform. Google independently implemented the Java API methods, but to ensure compatibility, it copied Java's method names, argument types, and the class and package hierarchy.