Patent Defense
The CPL license terminates automatically under two situations as of the date that a Recipient initiates certain kinds of patent litigation.
Many commercial open source licenses contain this kind of patent defense clause. A company such as IBM, with its vast portfolio of patents, wants to be able to terminate patent licenses when it is sued for patent infringement. That defensive use of patents is an important part of such companies' patent strategies.
This is the first situation:
...If Recipient institutes patent litigation against a Contributor with respect to a patent applicable to software (including a cross-claim or counterclaim in a lawsuit), then any patent licenses granted by that Contributor to such Recipient under this ...
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