To my point, you wouldn’t let a public SDR system tune into anything dodgy or attempt to break encryption and you definitely wouldn’t let it transmit.
There are multiple versions of SDR and normal radio receivers online and anything even vaguely contentious requires full verification and a proper licence (which I have anyway).
I don’t think anyone was recommending doing anything illegal, we were looking at the possibilities of joining a global network of listening posts (Which the physics of the arch has almost certainly killed anyway)
The UK has a huge number of SWL’s (short wave listeners) and scanner enthusiasts and has had for years, none of which are acting illegally. If you want to play with SDR and have a go yourself, have a look at http://www.websdr.org/
Courty