# License

This linter verifies if a file has a known license header.

By default, Firefox uses MPL-2 license with the [appropriate headers](https://www.mozilla.org/en-US/MPL/headers/).
In some cases (thirdpardy code), a file might have a different header file.
If this is the case, one of the significant line of the header should be listed in the list {searchfox}`of valid licenses <tools/lint/license/valid-licenses.txt>`.

## Run Locally

This mozlint linter can be run using mach:

```{eval-rst}
.. parsed-literal::

    $ mach lint --linter license <file paths>

```

## Configuration

This linter is enabled on most of the whole code base.

## Autofix

This linter provides a `--fix` option that adds the right MPL-2 header at the right place depending on the script or source language.

## Sources

- {searchfox}`Configuration (YAML) <tools/lint/license.yml>`
- {searchfox}`Source (Rust) <tools/lint/mozcheck/src/license.rs>`