It does not include non free software - basically it's debian (open source,
so you can read the code and free software) -- but its kernel it's not
deblobbed so if you use the module of the kernel in order to make for example
your ati graphics card work you are using a binary blob and you don't know
what that little part of tails is really doing.. And that could certainly
screw you..
That is my understanding but I may be wrong.
Anyway, unless you have a completely open hardware (no proprietary bios, no
proprietary firmware and all the hardware backdoors that is shipped on every
pc nowadays) you can't really be safe nor sure..
Lets not forget that this november more then 400 deep web hidden services
vere seized down and a lot of dudes are now in prison!
We are at a state now where real anonymity in the long run is simply not
possible.
cheers
