/usr/share/kde4/apps/ksplash/Themes/Default/Theme.rc is in kde-base-artwork 4:4.13.0-0ubuntu1.
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 | [KSplash Theme: Default]
Name = Default Splash Screen
Description = Air and Elarun Splash Screen
Version = 1.0
Author = Nuno Pinheiro <nuno@oxygen-icons.org>, Riccardo Iaconelli <riccardo@kde.org> and Marco Martin <notmart@gmail.com>
Homepage = http://www.kde.org
# Theme behaviour settings.
Engine = KSplashX
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