>>very very easily lose that freedom by adding contrib and non-free
>opening terminal to sudo mousepad /etc/apt/sources.list >writing your superuser psswd >manually adding contrib and non-free>not being a borderline sleepwalker with the habit of adding repositories while not aware of it.
---Conclusion: absolutely not 'very very easy' (unless you already don't give a pluck about software freedom, of course..)
