/usr/share/kivy-examples/kv/app_button.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 | #:kivy 1.0
#
Widget:
Button:
text: "Hello World"
Button:
text: "I'm another label"
pos: (200, 200)
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