in reply to Is there a list of 'license:' values in META.yml and what they mean?

META.yml files use the 1.x CPAN Meta spec. The list of licenses supported by this spec is available in CPAN::Meta::History::Meta_1_4.

META.json files use the 2.0 CPAN Meta spec. The list of licenses supported by this spec is available in CPAN::Meta::Spec.

In Section Seekers of Perl Wisdom