As discussed with Romain Guy in the email thread, the Apache 2.0
license applies to the affected .jpg files now and retroactively from
the time of import.
'wallpaper_goldengate.jpg' and 'wallpaper_goldengate_scale.jpg' were
altered using the exiftool:
exiftool -WebStatement=http://www.apache.org/licenses/LICENSE-2.0
Each of the other images was altered using the exiftool:
exiftool -URL=http://www.apache.org/licenses/LICENSE-2.0 \
-WebStatement=http://www.apache.org/licenses/LICENSE-2.0 \
-UsageTerms='Apache License Version 2.0'
Change-Id: I52a032fc6aa6373d2fb0ea941e041ea72764268c