It's the culmination of a battle that started 10 years ago, when tech company Oracle first accused Google of illegally copying its code.
The code in question is about 11,000 lines, accounting for less than 0.1% of the 15 million lines that make up Android software.
Given how dry and highly technical discussions of code inevitably are, it's no surprise that both sides have turned to metaphor to make their arguments.
It says what Google has done is like taking key parts of those books chapter titles, character names, the first sentence of each paragraph writing a new book, and selling it.
He says what Google did by using Java is simply how software is made: developers rely on using certain bits of code to build their programs.
The case poses two big questions for the Supreme Court, said Tejas Narechania, assistant professor of law at the University of California, Berkeley.
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