/usr/share/psychtoolbox-3/PsychDemos/MovieDemos/ is in psychtoolbox-3-common 3.0.11.20131230.dfsg1-1build1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/psychtoolbox-3/PsychDemos/MovieDemos/Contents.m
/usr/share/psychtoolbox-3/PsychDemos/MovieDemos/DetectionRTInVideoDemo.m
/usr/share/psychtoolbox-3/PsychDemos/MovieDemos/DualDiscs.mov
/usr/share/psychtoolbox-3/PsychDemos/MovieDemos/LoadMovieIntoTexturesDemo.m
/usr/share/psychtoolbox-3/PsychDemos/MovieDemos/PlayDualMoviesDemo.m
/usr/share/psychtoolbox-3/PsychDemos/MovieDemos/PlayInterlacedMovieDemo.m
/usr/share/psychtoolbox-3/PsychDemos/MovieDemos/PlayMoviesDemo.m
/usr/share/psychtoolbox-3/PsychDemos/MovieDemos/PlayMoviesWithoutGapDemo1.m
/usr/share/psychtoolbox-3/PsychDemos/MovieDemos/PlayMoviesWithoutGapDemo2.m
/usr/share/psychtoolbox-3/PsychDemos/MovieDemos/SimpleMovieDemo.m
/usr/share/psychtoolbox-3/PsychDemos/MovieDemos/octave-workspace