BUZZ-BlackBerry Ltd: Samsung makes takeover approach - sources
** Canadian smartphone maker's shares up 29 pct at $C$14.95, U.S.-listed shares up 29 pct at $12.56
** Reuters exclusively reported that Samsung has recently approached BlackBerry to buy the company for as much as $7.5 billion to gain access to its patent portfolio
** Samsung proposed an initial price range of $13.35 to $15.49 per share, the source said
** BlackBerry said in December that it still expects to double software revenue in 2015
** About 60 million shares changed hands on the New York Stock Exchange, more than six times their 10-day moving average
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