Major software innovations do not all come from big companies like Apple or Google.

A surprising number of developers eschew the gleaming campuses of Silicon Valley, choosing an alternative lifestyle coding in so-called communal "cybersquats" around the world.

BBC Click's Jen Copestake spent a week in one of the most renowned squats in Barcelona, following the developers of Bitcoin tools and other open source software.

Watch more clips on the Click website. If you are in the UK you can watch the whole programme on BBC iPlayer.