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As part of the standard set of linters that you get when you use ament_lint_auto or call the linters manually from the CLI is one that checks for copyrights in all of your source code files. This will check C / C++ / CMake / Python files for a header containing a software license as good general practice in software development (for some licenses, like BSD and Apache 2.0 that require it in every source file). There's nothing special about launch files, they're still python files that have copyrights attached to them like any other type of software - so you're probably just seeing that error because you have copyrights everywhere else but didn't include them in your launch files.