This file is indexed.

/usr/share/libwacom/isdv4-ef.tablet is in libwacom-common 0.8-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# this is for the Wacom pen as found in a limited special Tablet PC edition

[Device]
Name=Wacom ISDv4 EF
DeviceMatch=usb:056a:00ef
Class=ISDV4
IntegratedIn=Display;System

[Features]
Stylus=true
Buttons=0