There's more to the business decision to license/extend, than your post implies. If the rates and terms aren't particularly onerous, many prudent corporations will opt to pay small amounts of royalties that can easily be passed on to customers, rather than risk the great expenditures of manpower and money inherent in protracted litigation, which itself is unpredictable as to outcome. In other words, it's a simple cost/benefit and risk/benefit analysis. Apparently, the likes of Nokia, LG,the Chinese,Motorola Mobility, perhaps Samsung,and others, have the scale and resources to seek better leverage, and take the risk.
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