The Open Invention
Network, which offers patent protection for a wide range of open-source
software, has expanded its Linux System
Definition — the set of software covered by the OIN patent
non-aggression agreement. In particular, the new definition includes the
exFAT filesystem (once the subject of a lot of patent worries), the KDE Frameworks, the Robot Operating System, and version 10
of the Android Open Source Project.

Source: LWN.net – The Open Invention Network’s expanded Linux System Definition