See https://www.eff.org/deeplinks/2012/06/defensive-patent-license-and-other-ways-beat-patent-system https://www.eff.org/deeplinks/2012/06/defensive-patent-lice

See https://www.eff.org/deeplinks/2012/06/defensive-patent-license-and-other-ways-beat-patent-system https://www.eff.org/deeplinks/2012/06/defensive-patent-licen... I did some work on this years before the article, while in law school. Seems to be defunct now.