How are PubNub SDKs licensed? Craig Conover November 02, 2020 18:04 All PubNub SDKs are free and open-source MIT licensed and available on the PubNub GitHub unless otherwise stated in the SDK's license file. Related articles How can I create a new PubNub client SDK? Can I use PubNub for free? Does PubNub use WebSockets or some other protocol?