• Fable itself is free software, meaning it provides all the four freedoms as defined by the Free Software Foundation: use (for whatever purpose), study and change, share, share modified versions.

  • Fable should have little effect on the licensing of the outputs.

While we would prefer it if everyone only produced free software, we don't want to mandate it, and thus we've chosen to use a mix of permissive and copyleft licenses for different parts of the project.

As long as you only run Fable, you don't need to care about the licences, and you can use the outputs as you wish.

  • The Fable tooling (document and test program generators) are licensed under the GNU General Public Licence, version 3 or later.

  • The documents and test programs generated by Fable have whatever licence the input documents have. Fable has no effect on their licences.

  • Fable uses templates, libraries, and scaffolding to produce the outputs. These are licensed under the Apache 2.0 licence, but with the extra permission that when they're used to generate outputs by Fable, no license on the output applies.

  • The Fable documentation, inluding examples, are licensed under the CC-BY-SA 4.0 (International) licence. This is better suited for documentation than the code licences above.