https://arstechnica.com/gadgets/2018/10/microsoft-promises-to-defend-not-attack-linux-with-its-60000-patents/

Microsoft has made billions from its extensive library of software patents. A number of Android vendors, including Samsung, pay the company a royalty on each phone they ship to license patents such as the ones covering the exFAT file system. But that situation may be coming to an end with the announcement today that Microsoft is joining the Open Invention Network (OIN).

The Open Invention Network is a group of about 2,400 companies around the world that have agreed to cross-license their patents on a royalty-free basis for use by the "Linux System," a collection of projects including the Linux kernel, many tools and utilities built on top of Linux, and large parts of Android. Member companies also promise not to assert their patents against the Linux Community.