/usr/share/kde4/services/plasma-applet-gcal.desktop is in plasma-widget-googlecalendar 1.2-0ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Encoding=UTF-8
Name=Google Calendar — Coming Events
Name[no]=Google kalender — Kommende hendelser
Type=Service
ServiceTypes=Plasma/Applet
Icon=office-calendar
X-Plasma-API=python
X-Plasma-MainScript=code/main.py
X-KDE-PluginInfo-Author=Erlend Hamberg
X-KDE-PluginInfo-Email=ehamberg@gmail.com
X-KDE-PluginInfo-Name=gcal
X-KDE-PluginInfo-Version=1.0
X-KDE-PluginInfo-Website=http://plasma.kde.org/
X-KDE-PluginInfo-Category=Date and Time
X-KDE-PluginInfo-Depends=
X-KDE-PluginInfo-License=GPL
X-KDE-PluginInfo-EnabledByDefault=true
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