Licence

Source-available under the Functional Source License, converting to Apache-2.0.

Code
FSL-1.1-Apache-2.0
Permitted
Read, run, modify and build on the code
Not permitted
Offering it, or a product built from it, as a competing product
Conversion
Each release becomes Apache-2.0 two years after publication
Contracts and formats
CC-BY-4.0; implementable under any code licence
Contributions
Not accepted from outside Common Measure Ltd; bug reports are welcome as GitHub issues