/usr/share/kivy-examples/demo/kivycatalog/container_kvs/BoxLayoutContainer.kv is in python-kivy-examples 1.8.0+dfsg-2.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | #:kivy 1.4
BoxLayout:
orientation: 'vertical'
padding: 20
spacing: 10
Button:
text: "Button 1"
size_hint: 1, None
Button:
text: "Button 2"
size_hint: 1, 0.5
Button:
text: "Button 3"
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