Hello As noted in http://trisquel.info/es/issues/4061 , asunder ( a graphical Audio CD ripper and encoder ), run as wrapper for non-free codecs aac and monkey's audio code.
We have created a patch to remove those features: http://bzr.trisquel.info/package-helpers/trunk/files/head%3A/helpers/natty/DATA/asunder/ ( The patches must be applied in order, first aac's one and then monkey's ) In next days, and if no one objects, I will add it to the list of packages that do not respect the liberties on the wiki. /santi