Last week, Twitter did something big: they introduced a new patent assignment agreement that binds them to use their patent arsenal only for defensive purposes. In an environment where things are getting ugly in software patent land, this is a bold move. The agreement (here on GitHub), which they'll use for upcoming work and also apply retroactively, enforces the intent by both requiring complete inventor approval for any non-defensive use, and further, by granting inventors the right to sub-license the work in the case that Twitter breaks its part of the agreement. This is fascinating for lots of reasons, but I'll focus on three: First, because it's a hack on the system -- rather than attempting to make head-on patent law reform (a noble but unquestionably difficult cause), it creatively hacks a solution to the problem -- quickly and without needing to ask anyone's permission. It's beautiful that way, really. Don't like patent law? Then let's, collectively, change the way we use it -- if it works, then we'll have achieved the same goal with far less headache. The second reason is that it's a visible, powerful act of



