At this point we want the values enclosed between single quotes,
e.g. so that the fields are parsed easier by scripts.
This issue will not have any practical relevance as soon as the
key-value pair output support is merged.
mmcli is GPLv2+; that's what --version has always said and that's what the
README in ModemManager sources specifies:
License.
The ModemManager and mmcli binaries are both GPLv2+.
The libmm-glib library is LGPLv2+.