Oracle is suing Google for 9.3 Billion over the use of Java in the Android operating system. Java was written by Sun Microsystems which had been acquired by Oracle. The claim is that Google borrowed a little too liberally from Java in the Android operating system. Google claims they did clean room development, and merely figured out what Java expected from the software running it, and duplicated the API, or the programming interface. Oracle says their API was copyrighted. The whole computer industry relies on APIs, though, and the ability to use similar interfaces.
Oracle appealed all the way up to the Supreme Court, and the Supreme Court declined to hear the case. Now it's on trial again in Silicon Valley in front of a jury that knows nothing about technology.
Read more at Motherboard.vice.com