On October 7th, two of the U.S.’ largest tech companies squared off in the Supreme Court via teleconference. Since 2005, Oracle and Google have been battling over whether common interfaces between software programs can be protected by copyright. The specific interface in question, known as an application programming interface, or API, lets certain software programs “speak” to Java programs. When Google developed the Android Smartphone over a decade ago, it used Java’s API, and because Oracle now owns Java, Oracle believes it’s owed money—$9billion to be exact. This has led to what some consider the copyright case of the century.