ntributed 6 Enabling Technologies 6.3.6 Summary In this section, we showed that there are some players in the telecom ecosystem attempting to replicate the success of open source projects (e.g. Linux) in the enterprise and cloud. We introduced a number of RAN open source projects that are at various stages of development with various levels of activity. The most advanced one is the OAI, which is also the only one with active 5G development. One must note that OAI is released under a special "open source license," which allows patent holders to charge royalties on commercial usage of OAI RAN. Furthermore, several organizations (e.g. O-RAN Alliance and TIP) have active programs to develop open source 5G RAN, which are however yet to produce a working code. We expect open source to become more important in the future; however, it is not clear whether actual commercial open source RAN implementation will eventually emerge or if the open source activity will remain contained to academia and research. References GNU General Public License, version 2 (1991). GNU General Public License, version 2. Available at: https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.htm (accessed June 17, 2020). Tivoization (n.d.). Tivoization. Available at: https://en.wikipedia.org/wiki/Tivoization (accessed June 17, 2020). OAI Public License V1.1 (n.d.). OAI Public License V1.1. Available at: https://www .openairinterface.org/?page_id=698 (accessed June 17, 2020). OpenCellular (n.d.). OpenCellular. Available at: https://telecominfraproject.com/opencellular (accessed June 17, 2020). O-RAN Software Community (SC) (n.d.). Homepage. Available at: https://o-ran-sc.org (accessed June 17, 2020). OpenLTE (n.d.). Homepage. Available at: http://openlte.sourceforge.net (accessed June 17, 2020). srsLTE (n.d.). Homepage. Available at: https://www.srslte.com (accessed June 17, 2020). Software Radio Systems (n.d.). Homepage. Available at: https://www.softwareradiosystems .com (accessed June 17, 2020). OpenBTS (n.d.). Homepage. Available at: https://gith