/var/lib/polkit-1/localauthority/10-vendor.d/com.ubuntu.click.pkla is in packagekit-plugin-click 0.4.43+16.04.20160203-0ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | [Allow installation of Click packages]
Identity=unix-user:phablet
Action=com.ubuntu.click.package-install;com.ubuntu.click.package-remove
ResultAny=yes
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