This file is indexed.

/usr/share/software-center/ubuntu-license-key-helper is in software-center-aptdaemon-plugins 0.1.2.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/usr/bin/python

import logging
import json
from optparse import OptionParser
import os
import sys

sys.path.insert(0, "/usr/share/software-center")
from softwarecenter.backend.piston.scaclient import SoftwareCenterAgentAPI
import piston_mini_client.auth

import gettext
gettext.install("aptdaemon")

if __name__ == "__main__":

    parser = OptionParser()
    parser.add_option("-s", "--server", default="ubuntu-production")
    parser.add_option("-p", "--pkgname")
    (options, args) = parser.parse_args()
    
    # server to use
    if options.server == "ubuntu-production":
        server = "https://software-center.ubuntu.com"
    elif options.server == "ubuntu-staging":
        server = "https://sc.staging.ubuntu.com"
    else:
        raise Exception("Unknown license key server")

    # allow override via environment, note that in order for this to
    # work aptdaemon needs to be started with that environment
    if os.environ.get("SOFTWARE_CENTER_BUY_HOST"):
        server = os.environ.get("SOFTWARE_CENTER_BUY_HOST")
        logging.warn("overriding server from environment: '%s'" % server)

    # setup server root
    server += "/api/2.0"
    SoftwareCenterAgentAPI.default_service_root = server

    # pkgname
    pkgname = options.pkgname

    # wait for oauth token on stdin
    json_token = sys.stdin.readline()
    token = json.loads(json_token)
       
    # get the data
    auth = piston_mini_client.auth.OAuthAuthorizer(token["token"],
                                                   token["token_secret"],
                                                   token["consumer_key"],
                                                   token["consumer_secret"])
    
    api = SoftwareCenterAgentAPI(auth=auth)

    
    try:
        subscriptions =  api.subscriptions_for_me(complete_only=True)
    except piston_mini_client.APIError as e:
        sys.stderr.write(_("Failed to get the license key from "
                           "the server."))
        sys.exit(1)

    # find the right pkg
    license_key = None
    license_key_path = None
    for subscription in subscriptions:
        # paranoia, check if we actually have a license key attr too
        if (subscription.application["package_name"] == pkgname and
            hasattr(subscription, "license_key")):
            license_key = subscription.license_key
            license_key_path = subscription.license_key_path
            break

    if license_key and license_key_path:
        # aptdaemon expects a absolute path, fix that up
        if not license_key_path.startswith("/"):
            license_key_path = os.path.join("/opt", pkgname, license_key_path)

        sys.stdout.write(license_key_path + "\n")
        sys.stdout.write(license_key)
        sys.exit(0)

    # generic error
    sys.stderr.write(_("Failed to get the license key from "
                       "the server."))
    sys.exit(1)