There was this explanation from an HN user: https://news.ycombinator.com/item?id=8901357 https://news.ycombinator.com/item?id=8901357 But Facebook made changes

There was this explanation from an HN user: https://news.ycombinator.com/item?id=8901357 https://news.ycombinator.com/item?id=8901357 But Facebook made changes since then: http://www.infoworld.com/article/2908879/open-source-software/facebook-gives-in-on-patent-grant.html http://www.infoworld.com/article/2908879/open-source-softwar... I don't know much about it, just giving you links.