The project was originally arbitrarily licensed under the "MIT" license. However, Apache 2.0 is the preferred permissivelicense for Arduino tooling projects so that license is now used.

Whenever one of the recognized license file names are modified in the repository, the workflow runs to check whether thelicense can be recognized and whether it is of the expected type.GitHub has a useful automated license detection system that determines the license type used by a repository, andsurfaces that information in the repository home page, the search web interface, and the GitHub API. This licensedetection system requires that the license be defined by a dedicated file with one of several standardized filenames andpaths.GitHub's license detection system uses the popular licensee tool, so this file also serves to define the license typefor any other usages of licensee, as well as to human readers of the file.For this reason, and to ensure it remains a valid legal instrument, it's important that there be no non-standardmodifications to the license file or collisions with other supported license files. This workflow ensures that anychanges which would change the license type or which license file is used by the detection are caught automatically.