Don Armstrong wrote: > A slightly more appropriate patent clause is the one that is present > in the current version of the Apache Source License v2.0. [The > original version was similar to the RPSL, but ASF saw the light, so to > speak, and changed it to something that is (IMO) DFSG Free.] > > If You institute patent litigation against any entity (including a > cross-claim or counterclaim in a lawsuit) alleging that the Work or > a Contribution incorporated within the Work constitutes direct or > contributory patent infringement, then any patent licenses granted > to You under this License for that Work shall terminate as of the > date such litigation is filed.[1] > > Note that this only terminates the patent rights if you claim that the > work constitutes direct or contributory patent infringment... which > effectively uses the patents covered within the work to protect the > freeness of the work itself. I would like to second this clause; it is an effective protection against patent issues, without being too broad. Limiting the clause to actual allegations of patent infringement in the Work is indeed the key point. - Josh Triplett
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