A Yahoo sign at the company's headquarters in Sunnyvale, Calif. The company has announced a hacking of user accounts that happened in 2013, but it says payment card information was not accessed.
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Yahoo Chief Information Security Officer Bob Lord on encryption: "Yes, it's used by terrorists. It's also used by people who are looking to voice their opinions on issues and to save lives."
Yahoo CEO Marissa Mayer, seen speaking in San Francisco in November, says both Yahoo and its investors would have to pay taxes if Alibaba shares were given to investors.
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Yahoo co-founder Jerry Yang at the 2008 Consumer Electronics Show in Las Vegas. Yahoo will gain nearly $8 billion from the Alibaba IPO because of its $1 billion investment in Alibaba 2005.