TORONTO (Reuters) - Chinese personal computer maker Lenovo has signed a non-disclosure deal to examine the books of troubled Canadian smartphone maker BlackBerry Ltd, the Wall Street Journal said on Thursday, quoting unnamed sources. Smartphone pioneer BlackBerry said in August it was exploring strategic options that could include an outright sale. It has received a tentative $9 a share offer from a consortium led by its largest investor, Prem Watsa's Fairfax Financial Holdings Ltd, which wants to buy BlackBerry for $4. ...



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