"This case is about Google's use, in Google's business, of somebody else's property without permission," said Michael Jacobs, an attorney for Oracle, in his opening remarks to the jury.

Oracle sued Google 18 months ago, arguing that its Android operating system infringes Java patents and copyrights that Oracle acquired when it bought Sun Microsystems. Google denies any wrongdoing and says it doesn't need a license for the parts of Java it used.

Judge William Alsup, who is hearing the case, warned both sides on Monday that they'll need to show good cause for any evidence submitted at trial to be kept from the public, and that unflattering details about either side might emerge.

"Unless it's the recipe for Coca-Cola, it's going to be public," Alsup said. "If it reveals something embarrassing about the way one of these companies works, too bad. That's going to be out there for the public to see."

Most of the opening day was taken up with jury selection, but Jacobs had time to deliver Oracle's opening statement before the proceedings wrapped up. Google will give its opening statement Tuesday morning.