pkg query -a “%n-%v: %L”
if you have pkg 1.2, you can add this to your pkg.conf
alias: {
licenses: “query -a ‘%n-%v: %L'”
}

Now pkg licenses output:
tiff-4.0.3: BSD
tig-1.1: GPLv2
tradcpp-0.4: BSD
unixODBC-2.3.2: LGPL21
unixODBC-2.3.2: GPLv2
unzip-6.0_1: Info-ZIP
x11perf-1.5.4: MIT
xauth-1.0.7: MIT

For authors (I get you mean maintainers)
pkg query -a ‘%n-%v: %m’

so now
alias: {
licenses: “query -a ‘%n-%v: %L'”,
maintainers: “query -a ‘%n-%v: %m'”
}

$ pkg maintainers
xpdf-3.03_4: cy@FreeBSD.org
xprop-1.2.2: x11@FreeBSD.org
xproto-7.0.24: x11@FreeBSD.org
xrandr-1.4.1: x11@FreeBSD.org
xrdb-1.1.0: x11@FreeBSD.org
xrefresh-1.0.5: x11@FreeBSD.org
xset-1.2.3_1: x11@FreeBSD.org
xsetmode-1.0.0: x11@FreeBSD.org