Viewing cybernetic technologies as technologies of communication but also of control, the sociologist and professor Sergio Amadeu da Silveira addresses in this book the implications of the growth of digital networks and the establishment of a market for personal data collection and sale that encroaches on those environments. Referencing both prestigious authors and practical examples, the book brings to light the way in which this so-called "data market" – represented by companies and systems – has strived to approach individual privacy as an obstacle to be removed. Closely linked to the content, the book is published exclusively in digital format.