Google Inc is paying $12.5 billion to buy Motorola Mobility Holdings Inc in its biggest-ever deal, finally securing a swathe of valuable mobile patents to ramp up a war with Apple Inc and other rivals.

The acquisition of the company that invented the cellphone -- co-founder and CEO Larry Page's boldest move since taking the reins in April -- will transform the mobile landscape and gives Google one of the industry's largest patent libraries.

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