How to prefer official repository packages over GetDeb’s updated versions

Adapted this from yuvilio’s solution to down prioritize a PPA:

jani@saegusa:~$ cat /etc/apt/preferences.d/getdeb-unprefer
Package:  *
Pin: release o=GetDeb
Pin-Priority: 400

On Precise, this lets me install avidemux2.6 from GetDeb without pulling updated versions of other packages (transmission etc.) when doing a general update.