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				Zuckerberg, the founder of one of the world's largest companies, 
				faced hours of tough, public questioning about where Oculus 
				obtained its ideas and how much he knew about the startup when 
				Facebook bought it for $2 billion.
 A jury is hearing evidence in a civil lawsuit brought by 
				videogame publisher ZeniMax Media Inc against Oculus in 2014, in 
				the middle of the Facebook-Oculus deal. ZeniMax said that Oculus 
				unlawfully used its intellectual property to develop the 
				virtual-reality system that includes the Rift headset.
 
 During one heated exchange with ZeniMax lawyer Tony Sammi, 
				Zuckerberg told a jury in the crowded courtroom that the 
				technology was not even fully formed when Facebook bought it.
 
 "Improving on that technology doesn't make it yours," Sammi 
				countered. "If you steal my bike, paint it and put a bell on it, 
				does that make it your bike?"
 
 Zuckerberg, wearing a dark suit and striped tie rather than his 
				typical T-shirt and jeans, answered, "no," but then added: "The 
				idea that Oculus technology is based on someone else's is just 
				wrong."
 
 The 32-year-old Facebook founder has spoken about virtual 
				reality as an important part of the company's future business, 
				especially as the technology becomes less expensive and its uses 
				clearer.
 
 The Oculus acquisition was more expensive than the $2 billion 
				price tag indicated, Zuckerberg said in court, describing $700 
				million spent to retain employees and $300 million in payouts 
				for reaching milestones. Oculus originally wanted $4 billion, he 
				said.
 
 Sammi questioned whether Facebook knew what it was doing when it 
				made the acquisition. Zuckerberg said the Oculus deal was done 
				over a weekend in 2014, which Sammi said did not show sufficient 
				due diligence. Zuckerberg said, though, in later testimony that 
				Facebook researched Oculus for months.
 
 At the time, Zuckerberg testified, he was not aware of any theft 
				claims against Oculus.
 
 "It's pretty common when you announce a big deal that people 
				just come out of the woodwork and claim they own some part of 
				the deal," Zuckerberg said.
 
 On the stand, he also gave details about Facebook's $22 billion 
				purchase of messaging service WhatsApp in 2014. While the deal 
				was in progress, another company he did not identify made a 
				last-minute bid that was higher, Zuckerberg said, but WhatsApp 
				declined because of its good relationship with Facebook.
 
 The Oculus lawsuit, in the sixth day of a jury trial, relates in 
				part to programmer John Carmack.
 
 Well-known for helping to conceive games such as "Quake" and 
				"Doom," Carmack worked for id Software LLC before that company 
				was acquired by ZeniMax. He is now the chief technology officer 
				at Oculus.
 
 Zuckerberg denied that Carmack has unfairly used computer code 
				from his previous position. "There is no shared code in what we 
				do," he said.
 
 Zuckerberg said he has been interested in virtual reality since 
				he was a student, but thought it was decades away from happening 
				before he encountered Oculus. He told jurors how he used virtual 
				reality to capture his daughter's first steps, so her 
				grandparents could experience it later.
 
 "We want to get closer to this kind of perfect representation, 
				so you can capture a moment you had," he said.
 
 The case is ZeniMax Media Inc et al v. Oculus VR Inc et al, U.S. 
				District Court for the Northern District of Texas, No. 
				3:14-cv-1849.
 
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