vrms is just a Perl script for Debian and Ubuntu which tells you if you have a package from the non-free or contrib sections installed. Because of the way it works, you must not trust it for any other Debian or Ubuntu derivative unless the distro has a policy which ensures proprietary software only ends up in repository sections recognized by vrms as "non-free"; many derivatives (like Mint) make no effort to preserve this separation, and as a result vrms will happily report that you have no proprietary software and that "RMS would be proud" even if you do have proprietary software.

Not to mention, this script is incapable of detecting proprietary software installed by means other than the software repository. This also means it is completely useless in a completely libre distro like Trisquel; there are no non-free repositories, so the script will always report that you have no non-free software installed.

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