I had an attempt at solving this in snapd with the attached patch. This
passes through the "license" field from the store [1] and can make a
search in gnome-software show this license field.

However, this field doesn't exist for installed snaps. This is because
the snap metadata doesn't contain this field and instead contains
differently defined license fields [2] (it refers to a license file, not
a string).

This needs some design input to progress. It seems to me that one of the
following needs to occur:

- The license file that is referred in the snap YAML would have to be
copied into the store database. This file could then be accessed either
from the store or from a locally installed snap. This has the downsides
that common license (e.g. GPL) are hard to match (requires checking the
whole license file) and extra data would need to be downloaded (as
opposed to a short string).

- The snap YAML would gain the license field as used in the store. The
existing license file could remain for non-common / complex licenses.
The downside of this is that existing snaps might have a license set in
the store but not in the .snap file (searching in gnome-software would
show a  license but after install it would not).

[1] http://search.apps.ubuntu.com/docs/#package
[2] http://snapcraft.io/docs/build-snaps/syntax

** Patch added: "0001-Pass-through-license-field-from-the-store.patch"

** Changed in: gnome-software (Ubuntu)
   Importance: Medium => High

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  License information from the store not being used

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