All our work, including even this website, the language specification, and Ceylon Herd is freely available under open source licenses. Where possible, we're releasing our work under the Apache License. Certain components have more specialized licenses:

  • The Ceylon Java compiler is released under the GPL v2 + classpath exception because it's based on OpenJDK's javac compiler.
  • Ceylon IDE for Eclipse is released under the Eclipse Public License 1.0.
  • Ceylon Herd is released under the AGPL v3.

All other non tainted parts of Ceylon are released under the Apache Software License 2.0.

The website is released under Creative Commons Attribution Share-Alike 3.0 Unported (CC BY-SA 3.0) and sample code on the website is released under the Apache Software License 2.0.