I also think the conversion should only be done if the full License string can be converted. Partial conversion is confusing, and there is not much value, since trivial conversion is, well, trivial, and whoever will eventually need to take a look at the nontrivial parts can easily handle it then.
I'd add a "me too": I think if we have mixed spdx and callaways strings,
this will make later automatic processing even harder.
I that is possible, I think you should just do the full conversion for
those packages, even if that requires some manual introspection.

Ack. There is clear winner - not to mix the spdx and callaway.

I will do the change only for:

./bitstream-vera-fonts.spec:License: Bitstream Vera
./bpg-fonts.spec:License:       Bitstream Vera
./bpg-fonts.spec:License:       Bitstream Vera
./bpg-fonts.spec:License:       Bitstream Vera
./bpg-fonts.spec:License:       Bitstream Vera
./bpg-fonts.spec:License:       Bitstream Vera
./bpg-fonts.spec:License:       Bitstream Vera
./bpg-fonts.spec:License:       Bitstream Vera
./bpg-fonts.spec:License:       Bitstream Vera
./R-fontBitstreamVera.spec:License:          Bitstream Vera

-- 
Miroslav Suchy, RHCA
Red Hat, Manager, Packit and CPT, #brno, #fedora-buildsys