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# 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>`