liberty是开源的吗？

开发者版本是免费的，可以从wasdev.net下载。如果要用于生产环境，则需要购买。

To try out the Liberty profile and use the Liberty profile to develop applications that run on the WebSphere Application Server Liberty profile or full profile, you can download the no-charge developer edition from the WASdev community page. This edition runs on distributed platforms including IBM i, and on the Apple Mac. To use the Liberty profile in a production environment with guaranteed service levels and IBM support, you must purchase WebSphere Application Server Liberty Core, WebSphere Application Server (base), WebSphere Application Server Network Deployment or WebSphere Application Server Express.收起

Build and deploy awesome applications with the latest version of WebSphere Liberty! Built for developers yet ready for production, it’s a combination of IBM technology and open source software, with fast startup times (<2 seconds), no server restarts to pick up changes, and a simple XML configuration. All in a package that’s <55mb to download. You can be developing applications in no time.

it’s a combination of IBM technology and open source software
见 https://developer.ibm.com/wasdev/websphere-liberty/收起