BlackBerry Ltd. said Tuesday it has agreed to buy mobile security company WatchDox Ltd. for an undisclosed sum. The Palo Alto, Calif.-based WatchDox offers secure enterprise file-sync-and-share technology. BlackBerry shares were up 0.8% in premarket trade, but are down about 9% in the year so far, while the S&P 500 has gained about 2%.
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