/usr/share/kde4/servicetypes/kpeople_data_source.desktop is in libkpeople3 0.2.1-0ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | [Desktop Entry]
Type=ServiceType
X-KDE-ServiceType=KPeople/DataSource
|