https://hackernoon.com/did-microsoft-really-just-open-source-all-its-patents-3e419ae1a439 > This week, Microsoft announced its decision to join the Open Invention Network (‘OIN’) open-source patent consortium. Given Microsoft’s occasionally hostile relationship with open source, this announcement came as a surprise to many. Headlines and tweets proclaimed that Microsoft had “open sourced all its patents.” > Microsoft’s patent portfolio is one of the world’s largest and most valuable (reportedly, over 60,000 patents). Are all these patents now “open source?”