The Defensive Patent License makes patents less evil for open source

“But without patents of their own, FOSS developers have limited
their defense against patent bullies, those seeking to stop
innovation by filing patent infringement suits. And to some extent,
having no patents makes them vulnerable to patent trolls, those who
make no product and buy patents to collect royalties. So says the
DPLs creators, Jason Schultz and Jennifer Urban, law professors and
directors of UC Berkeley’s Samuelson Law, Technology & Public
Policy Clinic.”

Complete
Story