/usr/share/psychtoolbox-3/PsychHardware/DatapixxToolbox/60-vpixx-permissions.rules is in psychtoolbox-3-common 3.0.12.20160126.dfsg1-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | ATTR{manufacturer}=="VPixx", MODE="0666"
|