MacBook Air shipments strong; Apple eyes InterDigital;  Patent group sues again 
         Shipments of Apple's just-released MacBook Air will "remain strong" throughout this summer, possibly topping 1.5 million units, according to industry sources. Meanwhile, Apple is reportedly weighing a bid to purchase InterDigital for its wireless technology patents. Also, a patent licensing group that won $8 million from Apple is now suing for additional royalties, this time from the iPhone and iPad.           
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